Air at the Zenica - Radakovo station
Zenica, Zenica-Doboj Canton · Federation of Bosnia and Herzegovina
Network: Federal Hydrometeorological Institute · Station code: BA0039A
This year, up to yesterday (October 6)
at least
6 days
with a daily average of nitrogen dioxide (NO₂) above the legal limit of 85 µg/m³.
No such day is allowed.
The number allowed for the whole year has been exceeded.at least 6 days more than allowed
In 2025: 0 days above the limit, none allowed.
at least
12 days
with a daily average of sulphur dioxide (SO₂) above the legal limit of 125 µg/m³.
3 days are allowed in the whole year.
The number allowed for the whole year has been exceeded.at least 9 days more than allowed
Worst day: January 13, 2026, NO₂ 126 µg/m³ as a daily average, 1.5 times the limit.
SO₂ was above the alert threshold of 500 µg/m³ for at least 3 hours, three or more hours in a row (on 1 day).
At least 4 days with a daily average of PM10 above 150 µg/m³, the warning threshold in the Federation of BiH.
These are measured values only. Whether a warning or alert episode has been declared is decided and published by the competent authorities.
Also: at least 67 days above the legal daily limit for PM10 of 50 µg/m³ (35 allowed).
Also: at least 32 hours above the legal hourly limit for SO₂ of 350 µg/m³ (24 allowed).
Also: at least 2 hours above the legal hourly limit for NO₂ of 200 µg/m³ (too few readings to compare with the allowed number).
Daily average for 224 of 279 days · data for 2026 not yet finally verified · Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
Fair
Air now · Measured at 18:00
Latest values
Latest value: 18:00
| Pollutant | Value | Level |
|---|---|---|
| PM10 | 33.2 µg/m³ | Fair |
| NO₂Model estimate, not a measurement | 13 µg/m³ | no level |
| O₃ | 20.3 µg/m³ | Good |
| SO₂ | 22.5 µg/m³ | Fair |
How the air is changing
Over the last seven days there was more PM10, O₃, and SO₂ in the air than the week before.
- PM10: average 44.5 µg/m³, week before 27.9 µg/m³
- NO₂: too few readings to compare
- O₃: average 11.7 µg/m³, week before 10 µg/m³
- SO₂: average 42.7 µg/m³, week before 35.6 µg/m³
There are not enough readings to compare with the month before.
- PM10: too few readings to compare
- NO₂: too few readings to compare
- O₃: too few readings to compare
- SO₂: too few readings to compare
Show
Particulate matter PM10
33.2
Nowµg/m³
Measured at 18:00
66.7
Last 24 hoursµg/m³
measured in 92 % of hours · provisional
44.5
Last 7 daysµg/m³
measured in 100 % of hours · provisional
too few readings
Last 30 days
measured in 49 % of hours · provisional
too few readings
Last 12 months
measured in 88 % of hours · 1 month with too few readings · provisional
Days in 2023: PM10, daily average above 50 µg/m³
81 days above the limit.
- above the limit
- below the limit
- too few readings for the day
- no PM10 data in the EEA database
Days above the limit with values (81)
- Jan 1 81
- Jan 2 68
- Jan 3 64
- Jan 4 111
- Jan 5 57
- Jan 6 61
- Jan 8 69
- Jan 12 75
- Jan 13 53
- Jan 14 76
- Jan 16 84
- Jan 23 55
- Jan 24 59
- Jan 31 77
- Feb 1 68
- Feb 2 68
- Feb 9 73
- Feb 10 90
- Feb 11 103
- Feb 12 148
- Feb 13 111
- Feb 14 85
- Feb 15 88
- Feb 16 96
- Feb 17 87
- Feb 18 67
- Feb 19 51
- Feb 20 69
- Feb 21 81
- Feb 22 84
- Feb 23 73
- Feb 24 55
- Feb 25 59
- Mar 2 70
- Mar 3 83
- Mar 4 76
- Mar 5 70
- Mar 6 57
- Mar 17 52
- Mar 18 57
- Mar 22 52
- Jun 23 60
- Aug 18 66
- Oct 18 55
- Nov 7 52
- Nov 10 88
- Nov 12 57
- Nov 13 75
- Nov 19 68
- Nov 20 109
- Nov 21 113
- Nov 24 62
- Nov 27 76
- Nov 28 125
- Nov 29 50
- Nov 30 53
- Dec 4 61
- Dec 5 116
- Dec 6 61
- Dec 7 56
- Dec 8 93
- Dec 9 123
- Dec 10 177
- Dec 11 103
- Dec 12 93
- Dec 13 94
- Dec 17 95
- Dec 18 138
- Dec 19 111
- Dec 20 108
- Dec 21 148
- Dec 22 70
- Dec 23 99
- Dec 24 97
- Dec 25 82
- Dec 26 82
- Dec 27 111
- Dec 28 70
- Dec 29 130
- Dec 30 120
- Dec 31 103
Values in µg/m³, limit 50 µg/m³.
Months of 2023
| Month | Days above 50 | Highest day | No readings |
|---|---|---|---|
| January | 14 above the number allowed | 111 | 0 |
| February | 19 above the number allowed | 148 | 0 |
| March | 8 above the number allowed | 83 | 0 |
| April | 0 | 45 | 0 |
| May | 0 | 43 | 0 |
| June | 1 above the number allowed | 60 | 0 |
| July | 0 | 50 | 0 |
| August | 1 above the number allowed | 66 | 0 |
| September | 0 | 49 | 0 |
| October | 1 above the number allowed | 55 | 0 |
| November | 12 above the number allowed | 125 | 0 |
| December | 25 above the number allowed | 177 | 0 |
Values in µg/m³. ■ marks a month with at least one day above the limit; the number allowed applies to the whole year. “No readings”: days on which not a single reading came from the station.
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 19:00 | 33 | model estimate, not counted |
| 18:00 | 33.2 | |
| 17:00 | 35.1 | |
| 16:00 | 35.6 | |
| 15:00 | 49.9 | |
| 14:00 | 78.9 | |
| 13:00 | 67.1 | |
| 12:00 | 54.2 | |
| 11:00 | 93.6 | |
| 10:00 | 72.7 | |
| 09:00 | 68.2 | |
| 08:00 | 71.2 | |
| 07:00 | 54.8 | |
| 06:00 | 51.4 | |
| 05:00 | 54.2 | |
| 04:00 | 52.6 | |
| 03:00 | 53.3 | |
| 02:00 | 55.3 | |
| 01:00 | 62.6 | |
| Tuesday, 10/6 | ||
| 00:00 | 78.8 | |
| 23:00 | 91.9 | |
| 22:00 | 123.3 | |
| 21:00 | 128.8 | |
| 20:00 | 96.1 | |
| 19:00 | 75.3 | |
| 18:00 | 82.7 | |
| 17:00 | 69.4 | |
| 16:00 | 111.1 | |
| 15:00 | 204.8 | |
| 14:00 | 165.1 | |
| 13:00 | 91 | |
| 12:00 | 48.9 | |
| 11:00 | 62.2 | |
| 10:00 | 63.3 | |
| 09:00 | 71.8 | |
| 08:00 | 56.6 | |
| 07:00 | 47.3 | |
| 06:00 | 43.6 | |
| 05:00 | 46.1 | |
| 04:00 | 48.2 | |
| 03:00 | 55 | |
| 02:00 | 63.2 | |
| 01:00 | 71 | |
| Monday, 10/5 | ||
| 00:00 | 65.8 | |
| 23:00 | 70.8 | |
| 22:00 | 89.5 | |
| 21:00 | 93.3 | |
| 20:00 | 57.2 | |
| 19:00 | 52.3 | |
| 18:00 | 34.2 | |
| 17:00 | 24.5 | |
| 16:00 | 32.2 | |
| 15:00 | 36.4 | |
| 14:00 | 36.9 | |
| 13:00 | 32.2 | |
| 12:00 | 36.4 | |
| 11:00 | 39.3 | |
| 10:00 | 53.3 | |
| 09:00 | 50.6 | |
| 08:00 | 42.1 | |
| 07:00 | 34.1 | |
| 06:00 | 34.3 | |
| 05:00 | 35.7 | |
| 04:00 | 41.3 | |
| 03:00 | 38.9 | |
| 02:00 | 47.2 | |
| 01:00 | 49.6 | |
| Sunday, 10/4 | ||
| 00:00 | 61.1 | |
| 23:00 | 75 | |
| 22:00 | 88.2 | |
| 21:00 | 61.7 | |
| 20:00 | 33.8 | |
| 19:00 | 31.4 | |
| 18:00 | 30.3 | |
| 17:00 | 14.2 | |
| 16:00 | 11.2 | |
| 15:00 | 21.8 | |
| 14:00 | 25.7 | |
| 13:00 | 27.7 | |
| 12:00 | 29.8 | |
| 11:00 | 31.8 | |
| 10:00 | 28.8 | |
| 09:00 | 27.6 | |
| 08:00 | 30.3 | |
| 07:00 | 29.3 | |
| 06:00 | 27.9 | |
| 05:00 | 28.6 | |
| 04:00 | 37.9 | |
| 03:00 | 46.4 | |
| 02:00 | 51.6 | |
| 01:00 | 47.2 | |
| Saturday, 10/3 | ||
| 00:00 | 53.9 | |
| 23:00 | 62.6 | |
| 22:00 | 61.4 | |
| 21:00 | 41.4 | |
| 20:00 | 41.1 | |
| 19:00 | 20.3 | |
| 18:00 | 20.4 | |
| 17:00 | 18.6 | |
| 16:00 | 24.3 | |
| 15:00 | 19.9 | |
| 14:00 | 23.4 | |
| 13:00 | 36.5 | |
| 12:00 | 35.4 | |
| 11:00 | 33.1 | |
| 10:00 | 41.3 | |
| 09:00 | 31.8 | |
| 08:00 | 28.8 | |
| 07:00 | 30.9 | |
| 06:00 | 27.7 | |
| 05:00 | 33.9 | |
| 04:00 | 38.5 | |
| 03:00 | 43.4 | |
| 02:00 | 48.9 | |
| 01:00 | 66.5 | |
| Friday, 10/2 | ||
| 00:00 | 64.7 | |
| 23:00 | 60.8 | |
| 22:00 | 65.2 | |
| 21:00 | 63 | |
| 20:00 | 36.2 | |
| 19:00 | 15.4 | |
| 18:00 | 10.9 | |
| 17:00 | 15 | |
| 16:00 | 26.4 | |
| 15:00 | 23.9 | |
| 14:00 | 25.8 | |
| 13:00 | 31.3 | |
| 12:00 | 35.9 | |
| 11:00 | 37.9 | |
| 10:00 | 36.7 | |
| 09:00 | 34 | |
| 08:00 | 31.8 | |
| 07:00 | 26.1 | |
| 06:00 | 21.9 | |
| 05:00 | 24.3 | |
| 04:00 | 22.7 | |
| 03:00 | 30.5 | |
| 02:00 | 42.3 | |
| 01:00 | 49.1 | |
| Thursday, 10/1 | ||
| 00:00 | 54.6 | |
| 23:00 | 64.6 | |
| 22:00 | 73.4 | |
| 21:00 | 39.5 | |
| 20:00 | 33.3 | |
| 19:00 | 20.6 | |
| 18:00 | 20.6 | |
| 17:00 | 20.3 | |
| 16:00 | 27.6 | |
| 15:00 | 19.2 | |
| 14:00 | 23.8 | |
| 13:00 | 26 | |
| 12:00 | 28.9 | |
| 11:00 | 33.2 | |
| 10:00 | 32.8 | |
| 09:00 | 32.8 | |
| 08:00 | 26.6 | |
| 07:00 | 25.2 | |
| 06:00 | 27.6 | |
| 05:00 | 21.9 | |
| 04:00 | 29.2 | |
| 03:00 | 44.2 | |
| 02:00 | 63.1 | |
| 01:00 | 45 | |
| Wednesday, 9/30 | ||
| 00:00 | 51.3 | |
| 23:00 | 47.6 | |
| 22:00 | 53.6 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 83.1 | above the limit · provisional |
| Mon, 10/5 | 47 | provisional |
| Sun, 10/4 | 37.5 | provisional |
| Sat, 10/3 | 36.8 | provisional |
| Fri, 10/2 | 34.7 | provisional |
| Thu, 10/1 | 34.8 | provisional |
| Wed, 9/30 | 37.5 | provisional |
| Tue, 9/29 | 40.7 | provisional |
| Mon, 9/28 | 34.3 | provisional |
| Sun, 9/27 | 30.7 | provisional |
| Sat, 9/26 | 29.7 | provisional |
| Fri, 9/25 | 14.3 | provisional |
| Thu, 9/24 | 25.5 | provisional |
| Wed, 9/23 | 19.9 | provisional |
| Tue, 9/22 | too few readings | |
| Mon, 9/21 | no data from the station | |
| Sun, 9/20 | no data from the station | |
| Sat, 9/19 | no data from the station | |
| Fri, 9/18 | no data from the station | |
| Thu, 9/17 | no data from the station | |
| Wed, 9/16 | no data from the station | |
| Tue, 9/15 | no data from the station | |
| Mon, 9/14 | no data from the station | |
| Sun, 9/13 | no data from the station | |
| Sat, 9/12 | no data from the station | |
| Fri, 9/11 | no data from the station | |
| Thu, 9/10 | no data from the station | |
| Wed, 9/9 | no data from the station | |
| Tue, 9/8 | no data from the station | |
| Mon, 9/7 | no data from the station |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 45.6 | 34.4 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | too few readings | 31 | measured in 30 % of hours · provisional · 20 days without data from the station |
| August 2026 | 36.4 | 30.2 | measured in 93 % of hours · provisional |
| July 2026 | 25.8 | 29.5 | measured in 95 % of hours · provisional |
| June 2026 | 28.2 | 23 | measured in 92 % of hours · provisional · 1 day without data from the station |
| May 2026 | 25.5 | 25.4 | measured in 94 % of hours · provisional |
| April 2026 | 37.7 | 29.8 | measured in 79 % of hours · provisional · 4 days without data from the station |
| March 2026 | 59.4 | 40.7 | measured in 97 % of hours · provisional |
| February 2026 | 60.8 | 64.3 | measured in 100 % of hours · provisional |
| January 2026 | 92.8 | 48 | measured in 88 % of hours · provisional · 2 days without data from the station |
| December 2025 | 86.5 | 56.7 | measured in 99 % of hours · verified |
| November 2025 | 51.4 | 67.6 | measured in 95 % of hours · verified |
PM10 by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days above 50 µg/m³ (allowed 35) | ≥ 67 above the number allowed | 81 above the number allowed | 103 above the number allowed |
| Days above 150 µg/m³ (warning threshold FBiH) | ≥ 4 above the number allowed | 1 above the number allowed | 2 above the number allowed |
| Days above 300 µg/m³ (alert threshold FBiH) | 0 | 0 | 0 |
| Annual average, µg/m³ (legal limit 40) | too few | 41.3 above the number allowed | 44.8 above the number allowed |
| Highest daily average, µg/m³ | 210January 23 | 177December 10 | 193January 23 |
| Highest hourly value, µg/m³ | 326January 23 | 373December 10 | 389March 27 |
| Hours measured | 86 % | 97 % | 98 % |
| Days without any reading from the station | 27 | 0 | 0 |
* 2026 up to October 6; the average since the start of the year is not yet an annual average.
The monitoring networks have not yet finally verified this year’s data. The EEA publishes verified values once a year.
≥ means at least: more than a tenth of the days or hours are missing, so the real number may be higher.
Unverified hourly values of particulate matter from 975 µg/m³ up, and single spikes from 500 µg/m³ up between low values, count as missing. In the verified data for BiH from 2023 to 2025 no hour was above 600 µg/m³.
■ and a figure in red: more than is allowed for the whole year.
There is no allowed number for the warning and alert thresholds: every such hour or day is in red.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 45 µg/m³, 18 days allowed. In 2023 there were 100 such days.
- WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2023 there were 100 such days.
- EU from 2030: annual average 20 µg/m³. Average in 2023: 41 µg/m³.
- WHO 2021: annual average 15 µg/m³. Average in 2023: 41 µg/m³.
Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.
The worst days of 2023
| Day | Average | Times the limit |
|---|---|---|
| Dec 10, 2023 | 177 | 3.5 × |
| Dec 21, 2023 | 148 | 3.0 × |
| Feb 12, 2023 | 148 | 3.0 × |
| Dec 18, 2023 | 138 | 2.8 × |
| Dec 29, 2023 | 130 | 2.6 × |
Daily average in µg/m³, daily limit 50 µg/m³. Days with the same unverified value over many hours are not on this list.
Nitrogen dioxide NO₂
no measurement
Now
too few readings
Last 24 hours
measured in 0 % of hours
too few readings
Last 7 days
measured in 0 % of hours
too few readings
Last 30 days
measured in 23 % of hours · provisional
too few readings
Last 12 months
measured in 84 % of hours · 1 month with too few readings · provisional
Days in 2023: NO₂, daily average above 85 µg/m³
No measured day above the limit.
- above the limit
- below the limit
- too few readings for the day
- no NO₂ data in the EEA database
Months of 2023
| Month | Days above 85 | Hours above 200 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 48 | 0 |
| February | 0 | 0 | 66 | 0 |
| March | 0 | 0 | 46 | 0 |
| April | 0 | 0 | 35 | 0 |
| May | 0 | 0 | 25 | 0 |
| June | 0 | 0 | 20 | 0 |
| July | 0 | 0 | 20 | 0 |
| August | 0 | 0 | 16 | 0 |
| September | 0 | 0 | 20 | 0 |
| October | 0 | 0 | 25 | 0 |
| November | 0 | 0 | 35 | 0 |
| December | 0 | 0 | 38 | 0 |
Values in µg/m³. ■ marks a month with at least one day above the limit; the number allowed applies to the whole year. “No readings”: days on which not a single reading came from the station.
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 19:00 | 19 | model estimate, not counted |
| 18:00 | 13 | model estimate, not counted |
| 17:00 | 11 | model estimate, not counted |
| 16:00 | 7 | model estimate, not counted |
| 15:00 | 7 | model estimate, not counted |
| 14:00 | 7 | model estimate, not counted |
| 13:00 | 11 | model estimate, not counted |
| 12:00 | 15 | model estimate, not counted |
| 11:00 | 15 | model estimate, not counted |
| 10:00 | 18 | model estimate, not counted |
| 09:00 | 25 | model estimate, not counted |
| 08:00 | 23 | model estimate, not counted |
| 07:00 | 15 | model estimate, not counted |
| 06:00 | 12 | model estimate, not counted |
| 05:00 | 12 | model estimate, not counted |
| 04:00 | 12 | model estimate, not counted |
| 03:00 | 13 | model estimate, not counted |
| 02:00 | 13 | model estimate, not counted |
| 01:00 | 15 | model estimate, not counted |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no measurement | |
| Mon, 10/5 | no measurement | |
| Sun, 10/4 | no measurement | |
| Sat, 10/3 | no measurement | |
| Fri, 10/2 | no measurement | |
| Thu, 10/1 | no measurement | |
| Wed, 9/30 | no measurement | |
| Tue, 9/29 | too few readings | |
| Mon, 9/28 | 0.2 | provisional |
| Sun, 9/27 | 0.2 | provisional |
| Sat, 9/26 | 0.2 | provisional |
| Fri, 9/25 | 0.3 | provisional |
| Thu, 9/24 | 0.3 | provisional |
| Wed, 9/23 | 0.2 | provisional |
| Tue, 9/22 | too few readings | |
| Mon, 9/21 | no data from the station | |
| Sun, 9/20 | no data from the station | |
| Sat, 9/19 | no data from the station | |
| Fri, 9/18 | no data from the station | |
| Thu, 9/17 | no data from the station | |
| Wed, 9/16 | no data from the station | |
| Tue, 9/15 | no data from the station | |
| Mon, 9/14 | no data from the station | |
| Sun, 9/13 | no data from the station | |
| Sat, 9/12 | no data from the station | |
| Fri, 9/11 | no data from the station | |
| Thu, 9/10 | no data from the station | |
| Wed, 9/9 | no data from the station | |
| Tue, 9/8 | no data from the station | |
| Mon, 9/7 | no data from the station |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | too few readings | 14.5 | year before: same days |
| September 2026 | too few readings | 9.6 | measured in 24 % of hours · provisional · 20 days without data from the station |
| August 2026 | 0.3 | 9.7 | measured in 97 % of hours · provisional |
| July 2026 | 0.3 | 7.5 | measured in 95 % of hours · provisional |
| June 2026 | 0.2 | 8.1 | measured in 93 % of hours · provisional · 1 day without data from the station |
| May 2026 | 0.2 | 10.8 | measured in 94 % of hours · provisional |
| April 2026 | 0.2 | 15.3 | measured in 79 % of hours · provisional · 4 days without data from the station |
| March 2026 | 16.4 | 19.8 | measured in 100 % of hours · provisional |
| February 2026 | 43.4 | 33.5 | measured in 100 % of hours · provisional |
| January 2026 | 68.8 | 33.8 | measured in 88 % of hours · provisional · 2 days without data from the station |
| December 2025 | 45.8 | 25.1 | measured in 100 % of hours · verified |
| November 2025 | too few readings | 24.4 | measured in 61 % of hours · verified |
NO₂ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days above 85 µg/m³ (none allowed) | ≥ 6 above the number allowed | 0 | 0 |
| Hours above 200 µg/m³ (allowed 18) | ≥ 2² | 0 | 0 |
| Hours above 400 µg/m³, three hours in a row (alert threshold) | 0 | 0 | 0 |
| Annual average, µg/m³ (legal limit 40) | too few | 20.3 | 16.7 |
| Highest daily average, µg/m³ | 126January 13 | 76December 30 | 59January 23 |
| Highest hourly value, µg/m³ | 218January 23 | 154December 30 | 92January 23 |
| Hours measured | 84 % | 95 % | 98 % |
| Days without any reading from the station | 27 | 0 | 0 |
* 2026 up to October 6; the average since the start of the year is not yet an annual average.
The monitoring networks have not yet finally verified this year’s data. The EEA publishes verified values once a year.
≥ means at least: more than a tenth of the days or hours are missing, so the real number may be higher.
² Too few readings to compare with the number allowed: the figure covers only what was measured.
■ and a figure in red: more than is allowed for the whole year.
There is no allowed number for the warning and alert thresholds: every such hour or day is in red.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there were 5 such days.
- WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2023 there were 98 such days.
- EU from 2030: annual average 20 µg/m³. Average in 2023: 20 µg/m³.
- WHO 2021: annual average 10 µg/m³. Average in 2023: 20 µg/m³.
Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.
Ozone O₃
20.3
Nowµg/m³
Measured at 18:00
15.3
Last 24 hoursµg/m³
measured in 75 % of hours · provisional
11.7
Last 7 daysµg/m³
measured in 89 % of hours · provisional
too few readings
Last 30 days
measured in 46 % of hours · provisional
too few readings
Last 12 months
measured in 85 % of hours · 1 month with too few readings · provisional
Days in 2023: O₃, 8-hour average above 120 µg/m³
116 days above the limit.
- above the limit
- below the limit
- too few readings for the day
- no O₃ data in the EEA database
Days above the limit with values (116)
- Apr 21 176
- Apr 22 173
- Apr 23 163
- Apr 24 158
- Apr 25 142
- Apr 26 124
- Apr 27 149
- Apr 28 140
- Apr 29 172
- Apr 30 137
- May 1 149
- May 4 135
- May 5 144
- May 6 151
- May 7 145
- May 12 130
- May 16 143
- May 17 131
- May 20 135
- May 21 128
- May 22 136
- May 23 137
- May 24 138
- May 25 133
- May 26 128
- May 29 140
- May 30 130
- Jun 13 121
- Jun 18 121
- Jun 19 128
- Jun 20 146
- Jun 21 159
- Jun 22 234
- Jun 23 347
- Jun 24 277
- Jun 25 256
- Jun 26 218
- Jun 27 155
- Jun 28 148
- Jul 1 146
- Jul 2 150
- Jul 3 126
- Jul 4 135
- Jul 5 146
- Jul 6 136
- Jul 8 123
- Jul 9 126
- Jul 10 132
- Jul 11 131
- Jul 12 144
- Jul 13 147
- Jul 14 123
- Jul 15 179
- Jul 16 225
- Jul 19 184
- Jul 20 252
- Jul 21 258
- Jul 22 243
- Jul 23 244
- Jul 24 244
- Jul 25 238
- Jul 26 233
- Jul 27 236
- Jul 28 229
- Jul 29 232
- Jul 30 227
- Jul 31 209
- Aug 1 206
- Aug 2 214
- Aug 3 201
- Aug 4 215
- Aug 5 217
- Aug 6 192
- Aug 7 190
- Aug 8 193
- Aug 9 203
- Aug 10 202
- Aug 11 195
- Aug 12 206
- Aug 13 199
- Aug 14 197
- Aug 15 194
- Aug 16 205
- Aug 26 341
- Aug 27 330
- Aug 28 193
- Aug 29 155
- Sep 11 184
- Sep 12 194
- Sep 13 186
- Sep 14 184
- Sep 15 171
- Sep 16 174
- Sep 17 163
- Sep 18 159
- Sep 19 168
- Sep 20 162
- Sep 21 152
- Sep 22 157
- Sep 23 144
- Sep 24 158
- Sep 25 144
- Sep 26 159
- Sep 27 162
- Sep 28 159
- Sep 29 144
- Sep 30 167
- Oct 1 150
- Oct 2 121
- Oct 4 159
- Oct 5 159
- Oct 6 124
- Nov 3 128
- Nov 5 138
- Dec 1 130
- Dec 2 151
Values in µg/m³, limit 120 µg/m³.
Months of 2023
| Month | Days above 120 | Highest 8 h | No readings |
|---|---|---|---|
| January | 0 | 66 | 0 |
| February | 0 | 69 | 0 |
| March | 0 | 82 | 0 |
| April | 10 above the number allowed | 176 | 0 |
| May | 17 above the number allowed | 151 | 0 |
| June | 12 above the number allowed | 347 | 0 |
| July | 28 above the number allowed | 258 | 0 |
| August | 20 above the number allowed | 341 | 0 |
| September | 20 above the number allowed | 194 | 0 |
| October | 5 above the number allowed | 159 | 0 |
| November | 2 above the number allowed | 138 | 0 |
| December | 2 above the number allowed | 151 | 0 |
Values in µg/m³. ■ marks a month with at least one day above the limit; the number allowed applies to the whole year. “No readings”: days on which not a single reading came from the station.
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 19:00 | 56 | model estimate, not counted |
| 18:00 | 20.3 | |
| 17:00 | 28.9 | |
| 16:00 | 35.8 | |
| 15:00 | 45.9 | |
| 14:00 | 48.7 | |
| 13:00 | 35.7 | |
| 12:00 | 21.4 | |
| 11:00 | 16 | |
| 10:00 | 2.8 | |
| 09:00 | 1 | |
| 08:00 | 26 | model estimate, not counted |
| 07:00 | 26 | model estimate, not counted |
| 06:00 | 0.8 | |
| 05:00 | 2.8 | |
| 04:00 | 3.9 | |
| 03:00 | 3.3 | |
| 02:00 | 4.1 | |
| 01:00 | 2.4 | |
| Tuesday, 10/6 | ||
| 00:00 | 1.4 | |
| 23:00 | 0.9 | |
| 20:00 | 0.1 | |
| 19:00 | 7.2 | |
| 18:00 | 18.6 | |
| 17:00 | 28 | |
| 16:00 | 36.3 | |
| 15:00 | 51.3 | |
| 14:00 | 62.9 | |
| 13:00 | 49.3 | |
| 12:00 | 35.7 | |
| 11:00 | 18.6 | |
| 10:00 | 6.2 | |
| 06:00 | 1.1 | |
| 05:00 | 2 | |
| 04:00 | 3.6 | |
| 03:00 | 1.6 | |
| 02:00 | 0.9 | |
| Monday, 10/5 | ||
| 23:00 | 1.4 | |
| 20:00 | 1.8 | |
| 19:00 | 11.3 | |
| 18:00 | 18.6 | |
| 17:00 | 19.6 | |
| 16:00 | 21.1 | |
| 15:00 | 22.9 | |
| 14:00 | 25.4 | |
| 13:00 | 25.3 | |
| 12:00 | 24.2 | |
| 11:00 | 19.4 | |
| 10:00 | 12.2 | |
| 09:00 | 1.4 | |
| 06:00 | 3.1 | |
| 05:00 | 3.5 | |
| 04:00 | 5.9 | |
| 03:00 | 7 | |
| 02:00 | 6.5 | |
| 01:00 | 3.7 | |
| Sunday, 10/4 | ||
| 00:00 | 2.8 | |
| 23:00 | 2.2 | |
| 22:00 | 3.4 | |
| 21:00 | 0.1 | |
| 20:00 | 10.7 | |
| 19:00 | 15.2 | |
| 18:00 | 17.8 | |
| 17:00 | 18.5 | |
| 16:00 | 18.3 | |
| 15:00 | 20.1 | |
| 14:00 | 22.1 | |
| 13:00 | 20.2 | |
| 12:00 | 24 | |
| 11:00 | 19.2 | |
| 10:00 | 10.7 | |
| 09:00 | 5.6 | |
| 08:00 | 1.7 | |
| 07:00 | 1.5 | |
| 06:00 | 3.8 | |
| 05:00 | 4.4 | |
| 04:00 | 6.8 | |
| 03:00 | 5.2 | |
| 02:00 | 5.1 | |
| 01:00 | 2.2 | |
| Saturday, 10/3 | ||
| 00:00 | 1.3 | |
| 23:00 | 2.6 | |
| 22:00 | 1.4 | |
| 21:00 | 0.1 | |
| 20:00 | 12.5 | |
| 19:00 | 12.6 | |
| 18:00 | 18.3 | |
| 17:00 | 19.8 | |
| 16:00 | 20.4 | |
| 15:00 | 23.2 | |
| 14:00 | 25.3 | |
| 13:00 | 24.7 | |
| 12:00 | 22.2 | |
| 11:00 | 21.2 | |
| 10:00 | 14.2 | |
| 09:00 | 4.1 | |
| 07:00 | 1.2 | |
| 06:00 | 2.9 | |
| 05:00 | 5.5 | |
| 04:00 | 4.1 | |
| 03:00 | 2.4 | |
| Friday, 10/2 | ||
| 00:00 | 2 | |
| 23:00 | 0.7 | |
| 22:00 | 0.5 | |
| 20:00 | 2.8 | |
| 19:00 | 12 | |
| 18:00 | 17.3 | |
| 17:00 | 19.3 | |
| 16:00 | 21.8 | |
| 15:00 | 23 | |
| 14:00 | 27.1 | |
| 13:00 | 24.7 | |
| 12:00 | 17.9 | |
| 11:00 | 12.8 | |
| 10:00 | 8.2 | |
| 09:00 | 3 | |
| 06:00 | 1.6 | |
| 05:00 | 3.9 | |
| 04:00 | 5.4 | |
| 03:00 | 6.2 | |
| 02:00 | 5.4 | |
| 01:00 | 4.6 | |
| Thursday, 10/1 | ||
| 00:00 | 0.3 | |
| 23:00 | 3.8 | |
| 22:00 | 0.1 | |
| 21:00 | 0.5 | |
| 20:00 | 9.2 | |
| 19:00 | 10.9 | |
| 18:00 | 17 | |
| 17:00 | 18.1 | |
| 16:00 | 19.3 | |
| 15:00 | 21 | |
| 14:00 | 24.4 | |
| 13:00 | 27.3 | |
| 12:00 | 27.2 | |
| 11:00 | 18 | |
| 10:00 | 6.4 | |
| 09:00 | 2.1 | |
| 08:00 | 0.2 | |
| 06:00 | 3.5 | |
| 05:00 | 3 | |
| 04:00 | 5.7 | |
| 03:00 | 4.2 | |
| 02:00 | 4.5 | |
| 01:00 | 3.2 | |
| Wednesday, 9/30 | ||
| 00:00 | 2.7 | |
| 23:00 | 2.2 | |
| 22:00 | 5.3 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | too few readings | |
| Mon, 10/5 | 22.1 | provisional |
| Sun, 10/4 | 20 | provisional |
| Sat, 10/3 | 21.9 | provisional |
| Fri, 10/2 | 20.5 | provisional |
| Thu, 10/1 | 21.5 | provisional |
| Wed, 9/30 | 21.6 | provisional |
| Tue, 9/29 | 21.9 | provisional |
| Mon, 9/28 | 21.4 | provisional |
| Sun, 9/27 | 19.6 | provisional |
| Sat, 9/26 | 16.5 | provisional |
| Fri, 9/25 | 17.2 | provisional |
| Thu, 9/24 | 16.9 | provisional |
| Wed, 9/23 | 13.9 | provisional |
| Tue, 9/22 | too few readings | |
| Mon, 9/21 | no data from the station | |
| Sun, 9/20 | no data from the station | |
| Sat, 9/19 | no data from the station | |
| Fri, 9/18 | no data from the station | |
| Thu, 9/17 | no data from the station | |
| Wed, 9/16 | no data from the station | |
| Tue, 9/15 | no data from the station | |
| Mon, 9/14 | no data from the station | |
| Sun, 9/13 | no data from the station | |
| Sat, 9/12 | no data from the station | |
| Fri, 9/11 | no data from the station | |
| Thu, 9/10 | no data from the station | |
| Wed, 9/9 | no data from the station | |
| Tue, 9/8 | no data from the station | |
| Mon, 9/7 | no data from the station |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 11.8 | 26.7 | measured in 88 % of hours · provisional · year before: same days |
| September 2026 | too few readings | 24.8 | measured in 30 % of hours · provisional · 20 days without data from the station |
| August 2026 | 20.9 | 35.1 | measured in 97 % of hours · provisional |
| July 2026 | 18.4 | 39.8 | measured in 95 % of hours · provisional |
| June 2026 | 19.6 | 49.8 | measured in 93 % of hours · provisional · 1 day without data from the station |
| May 2026 | 25.4 | 38.1 | measured in 94 % of hours · provisional |
| April 2026 | 27.9 | 48.1 | measured in 79 % of hours · provisional · 4 days without data from the station |
| March 2026 | 17.6 | 47.6 | measured in 100 % of hours · provisional |
| February 2026 | 11.9 | too few readings | measured in 100 % of hours · provisional |
| January 2026 | 9.5 | 29 | measured in 88 % of hours · provisional · 2 days without data from the station |
| December 2025 | 3.7 | 17.5 | measured in 100 % of hours · verified |
| November 2025 | too few readings | 18.2 | measured in 63 % of hours · verified |
O₃ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days with 8-hour average above 120 µg/m³ (target value 25) | 0² | 0² | ≥ 40 |
| Annual average, µg/m³ | too few | 32.5 | 53.3 |
| Highest 8-hour average, µg/m³ | 62April 26 | 105March 9 | 166July 18 |
| Hours measured | 86 % | 90 % | 91 % |
| Days without any reading from the station | 27 | 0 | 0 |
* 2026 up to October 6; the average since the start of the year is not yet an annual average.
The monitoring networks have not yet finally verified this year’s data. The EEA publishes verified values once a year.
≥ means at least: more than a tenth of the days or hours are missing, so the real number may be higher.
² Too few readings to compare with the number allowed: the figure covers only what was measured.
■ and a figure in red: more than is allowed for the whole year.
The column for 2023 is shown on wider screens.
The worst days of 2023
| Day | Highest 8 h | Times the limit |
|---|---|---|
| Jun 23, 2023 | 347 | 2.9 × |
| Aug 26, 2023 | 341 | 2.8 × |
| Aug 27, 2023 | 330 | 2.7 × |
| Jun 24, 2023 | 277 | 2.3 × |
| Jul 21, 2023 | 258 | 2.1 × |
Daily average in µg/m³, daily limit 120 µg/m³. Days with the same unverified value over many hours are not on this list.
Sulphur dioxide SO₂
22.5
Nowµg/m³
Measured at 18:00
39.4
Last 24 hoursµg/m³
measured in 92 % of hours · provisional
42.7
Last 7 daysµg/m³
measured in 100 % of hours · provisional
too few readings
Last 30 days
measured in 49 % of hours · provisional
too few readings
Last 12 months
measured in 87 % of hours · 1 month with too few readings · provisional
Days in 2023: SO₂, daily average above 125 µg/m³
44 days above the limit.
- above the limit
- below the limit
- too few readings for the day
- no SO₂ data in the EEA database
Days above the limit with values (44)
- Oct 8 179
- Oct 12 140
- Nov 9 168
- Nov 12 150
- Nov 13 196
- Nov 14 144
- Nov 16 160
- Nov 19 220
- Nov 20 195
- Nov 21 160
- Nov 23 141
- Nov 24 275
- Nov 27 279
- Nov 28 226
- Nov 29 148
- Nov 30 141
- Dec 4 169
- Dec 5 273
- Dec 6 159
- Dec 7 181
- Dec 8 241
- Dec 9 319
- Dec 10 348
- Dec 11 301
- Dec 12 234
- Dec 13 214
- Dec 14 161
- Dec 15 130
- Dec 16 138
- Dec 17 265
- Dec 18 294
- Dec 19 225
- Dec 20 216
- Dec 21 270
- Dec 22 191
- Dec 23 227
- Dec 24 306
- Dec 25 244
- Dec 26 219
- Dec 27 227
- Dec 28 178
- Dec 29 293
- Dec 30 290
- Dec 31 239
Values in µg/m³, limit 125 µg/m³.
Months of 2023
| Month | Days above 125 | Hours above 350 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 51 | 0 |
| February | 0 | 0 | 74 | 0 |
| March | 0 | 0 | 47 | 0 |
| April | 0 | 0 | 33 | 0 |
| May | 0 | 0 | 37 | 0 |
| June | 0 | 0 | 47 | 0 |
| July | 0 | 1 | 64 | 0 |
| August | 0 | 3 | 69 | 0 |
| September | 0 | 2 | 84 | 0 |
| October | 2 above the number allowed | 12 | 179 | 0 |
| November | 14 above the number allowed | 19 | 279 | 0 |
| December | 28 above the number allowed | 87 | 348 | 0 |
Values in µg/m³. ■ marks a month with at least one day above the limit; the number allowed applies to the whole year. “No readings”: days on which not a single reading came from the station.
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 18:00 | 22.5 | |
| 17:00 | 55.8 | |
| 16:00 | 69.6 | |
| 15:00 | 43.6 | |
| 14:00 | 65.5 | |
| 13:00 | 92.2 | |
| 12:00 | 75.4 | |
| 11:00 | 36.3 | |
| 10:00 | 33.7 | |
| 09:00 | 26.7 | |
| 08:00 | 23.1 | |
| 07:00 | 21.4 | |
| 06:00 | 20.7 | |
| 05:00 | 20.7 | |
| 04:00 | 22.7 | |
| 03:00 | 24.4 | |
| 02:00 | 25.6 | |
| 01:00 | 28.8 | |
| Tuesday, 10/6 | ||
| 00:00 | 32.2 | |
| 23:00 | 39.8 | |
| 22:00 | 38.6 | |
| 21:00 | 47 | |
| 20:00 | 41.6 | |
| 19:00 | 30.7 | |
| 18:00 | 30.7 | |
| 17:00 | 36.3 | |
| 16:00 | 45.9 | |
| 15:00 | 109.3 | |
| 14:00 | 168.2 | |
| 13:00 | 88.5 | |
| 12:00 | 83.1 | |
| 11:00 | 40.4 | |
| 10:00 | 29.2 | |
| 09:00 | 24.3 | |
| 08:00 | 19.8 | |
| 07:00 | 18.8 | |
| 06:00 | 19.6 | |
| 05:00 | 21.8 | |
| 04:00 | 24.4 | |
| 03:00 | 25 | |
| 02:00 | 29.6 | |
| 01:00 | 37.2 | |
| Monday, 10/5 | ||
| 00:00 | 42.4 | |
| 23:00 | 49.3 | |
| 22:00 | 51.6 | |
| 21:00 | 55.8 | |
| 20:00 | 65.5 | |
| 19:00 | 74.5 | |
| 18:00 | 84.6 | |
| 17:00 | 96.7 | |
| 16:00 | 56 | |
| 15:00 | 73.2 | |
| 14:00 | 139.6 | |
| 13:00 | 126.2 | |
| 12:00 | 47.7 | |
| 11:00 | 31.3 | |
| 10:00 | 27.1 | |
| 09:00 | 23.8 | |
| 08:00 | 20.1 | |
| 07:00 | 18.6 | |
| 06:00 | 19 | |
| 05:00 | 21.4 | |
| 04:00 | 21.4 | |
| 03:00 | 22.8 | |
| 02:00 | 26 | |
| 01:00 | 27.9 | |
| Sunday, 10/4 | ||
| 00:00 | 35 | |
| 23:00 | 41.9 | |
| 22:00 | 50.5 | |
| 21:00 | 45.1 | |
| 20:00 | 44.5 | |
| 19:00 | 46.8 | |
| 18:00 | 70.5 | |
| 17:00 | 70.9 | |
| 16:00 | 54.2 | |
| 15:00 | 39 | |
| 14:00 | 155.6 | |
| 13:00 | 443.7 | above the limit |
| 12:00 | 124.4 | |
| 11:00 | 35.8 | |
| 10:00 | 26 | |
| 09:00 | 22 | |
| 08:00 | 18 | |
| 07:00 | 17.2 | |
| 06:00 | 17.8 | |
| 05:00 | 18.4 | |
| 04:00 | 18.5 | |
| 03:00 | 19.2 | |
| 02:00 | 20.5 | |
| 01:00 | 23.3 | |
| Saturday, 10/3 | ||
| 00:00 | 28.5 | |
| 23:00 | 39.3 | |
| 22:00 | 45.3 | |
| 21:00 | 32.5 | |
| 20:00 | 21.9 | |
| 19:00 | 17.5 | |
| 18:00 | 28.4 | |
| 17:00 | 26.9 | |
| 16:00 | 20 | |
| 15:00 | 90.1 | |
| 14:00 | 154.2 | |
| 13:00 | 130.3 | |
| 12:00 | 103.3 | |
| 11:00 | 31.5 | |
| 10:00 | 26.9 | |
| 09:00 | 22.1 | |
| 08:00 | 19.3 | |
| 07:00 | 18.8 | |
| 06:00 | 19.1 | |
| 05:00 | 19.5 | |
| 04:00 | 21 | |
| 03:00 | 22.3 | |
| 02:00 | 23.3 | |
| 01:00 | 26.8 | |
| Friday, 10/2 | ||
| 00:00 | 30.6 | |
| 23:00 | 37.4 | |
| 22:00 | 31.8 | |
| 21:00 | 28.7 | |
| 20:00 | 24 | |
| 19:00 | 22.4 | |
| 18:00 | 17.9 | |
| 17:00 | 16.2 | |
| 16:00 | 28.3 | |
| 15:00 | 100.6 | |
| 14:00 | 85.4 | |
| 13:00 | 86.1 | |
| 12:00 | 234.3 | |
| 11:00 | 60.7 | |
| 10:00 | 26.7 | |
| 09:00 | 22 | |
| 08:00 | 17.9 | |
| 07:00 | 17.4 | |
| 06:00 | 17.5 | |
| 05:00 | 17.3 | |
| 04:00 | 17.6 | |
| 03:00 | 17.8 | |
| 02:00 | 18.8 | |
| 01:00 | 20.5 | |
| Thursday, 10/1 | ||
| 00:00 | 23.5 | |
| 23:00 | 24.4 | |
| 22:00 | 30.9 | |
| 21:00 | 34.1 | |
| 20:00 | 20.6 | |
| 19:00 | 22.6 | |
| 18:00 | 23 | |
| 17:00 | 23.6 | |
| 16:00 | 22.1 | |
| 15:00 | 89.8 | |
| 14:00 | 55.6 | |
| 13:00 | 27.9 | |
| 12:00 | 33.5 | |
| 11:00 | 32.2 | |
| 10:00 | 23 | |
| 09:00 | 18 | |
| 08:00 | 17.3 | |
| 07:00 | 17.1 | |
| 06:00 | 17.7 | |
| 05:00 | 18.6 | |
| 04:00 | 19.5 | |
| 03:00 | 20.8 | |
| 02:00 | 22.8 | |
| 01:00 | 24.8 | |
| Wednesday, 9/30 | ||
| 00:00 | 24.6 | |
| 23:00 | 24.1 | |
| 22:00 | 25.2 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 45.1 | provisional |
| Mon, 10/5 | 50.9 | provisional |
| Sun, 10/4 | 60.8 | provisional |
| Sat, 10/3 | 41.2 | provisional |
| Fri, 10/2 | 41.6 | provisional |
| Thu, 10/1 | 27.6 | provisional |
| Wed, 9/30 | 31.8 | provisional |
| Tue, 9/29 | 29.4 | provisional |
| Mon, 9/28 | 51.5 | provisional |
| Sun, 9/27 | 28.2 | provisional |
| Sat, 9/26 | 24.6 | provisional |
| Fri, 9/25 | 19.3 | provisional |
| Thu, 9/24 | 76 | provisional |
| Wed, 9/23 | 20.3 | provisional |
| Tue, 9/22 | too few readings | |
| Mon, 9/21 | no data from the station | |
| Sun, 9/20 | no data from the station | |
| Sat, 9/19 | no data from the station | |
| Fri, 9/18 | no data from the station | |
| Thu, 9/17 | no data from the station | |
| Wed, 9/16 | no data from the station | |
| Tue, 9/15 | no data from the station | |
| Mon, 9/14 | no data from the station | |
| Sun, 9/13 | no data from the station | |
| Sat, 9/12 | no data from the station | |
| Fri, 9/11 | no data from the station | |
| Thu, 9/10 | no data from the station | |
| Wed, 9/9 | no data from the station | |
| Tue, 9/8 | no data from the station | |
| Mon, 9/7 | no data from the station |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 44.5 | 61.2 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | too few readings | 67.5 | measured in 30 % of hours · provisional · 20 days without data from the station |
| August 2026 | 31.3 | 67.3 | measured in 97 % of hours · provisional |
| July 2026 | 30.3 | 59.4 | measured in 95 % of hours · provisional |
| June 2026 | 17.1 | 53.8 | measured in 93 % of hours · provisional · 1 day without data from the station |
| May 2026 | 14.1 | 51.2 | measured in 90 % of hours · provisional |
| April 2026 | 15.6 | 52 | measured in 78 % of hours · provisional · 4 days without data from the station |
| March 2026 | 42.5 | 76.9 | measured in 95 % of hours · provisional |
| February 2026 | 58 | 125.7 | measured in 100 % of hours · provisional |
| January 2026 | 114.4 | 181 | measured in 88 % of hours · provisional · 2 days without data from the station |
| December 2025 | 172.2 | 175.9 | measured in 100 % of hours · verified |
| November 2025 | 94.9 | 133.8 | measured in 83 % of hours · verified |
SO₂ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days above 125 µg/m³ (allowed 3) | ≥ 12 above the number allowed | 68 above the number allowed | 66 above the number allowed |
| Hours above 350 µg/m³ (allowed 24) | ≥ 32 above the number allowed | 289 above the number allowed | 340 above the number allowed |
| Hours above 500 µg/m³, three hours in a row (alert threshold) | ≥ 3 above the number allowed | 91 above the number allowed | 149 above the number allowed |
| Annual average, µg/m³ (legal limit 50) | too few | 91.9 above the number allowed | 83.2 above the number allowed |
| Highest daily average, µg/m³ | 282January 22 | 682January 19 | 1,020December 29 |
| Highest hourly value, µg/m³ | 573January 12 | 1,379January 19 | 1,331December 29 |
| Hours measured | 85 % | 99 % | 91 % |
| Days without any reading from the station | 27 | 0 | 0 |
* 2026 up to October 6; the average since the start of the year is not yet an annual average.
The monitoring networks have not yet finally verified this year’s data. The EEA publishes verified values once a year.
≥ means at least: more than a tenth of the days or hours are missing, so the real number may be higher.
■ and a figure in red: more than is allowed for the whole year.
There is no allowed number for the warning and alert thresholds: every such hour or day is in red.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there were 96 such days.
- WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2023 there were 124 such days.
- EU from 2030: annual average 20 µg/m³. Average in 2023: 59 µg/m³.
Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.
The worst days of 2023
| Day | Average | Times the limit |
|---|---|---|
| Dec 10, 2023 | 348 | 2.8 × |
| Dec 9, 2023 | 319 | 2.6 × |
| Dec 24, 2023 | 306 | 2.4 × |
| Dec 11, 2023 | 301 | 2.4 × |
| Dec 18, 2023 | 294 | 2.3 × |
Daily average in µg/m³, daily limit 125 µg/m³. Days with the same unverified value over many hours are not on this list.
Outages in the last 12 months
Every period of at least 24 hours in which no reading arrived from this station.
Days without a reading: 36
8 outages, 853 hours in total in the last 12 months.
Timeline of outages from October 7, 2025 to today
| From | To | Duration |
|---|---|---|
| Sep 1, 2026 09:00 | Sep 22, 2026 09:00 | 21 days |
| Jul 1, 2026 09:00 | Jul 2, 2026 09:00 | 24 hours |
| Jun 9, 2026 05:00 | Jun 11, 2026 11:00 | 2 days |
| May 23, 2026 01:00 | May 24, 2026 08:00 | 31 hours |
| Apr 10, 2026 04:00 | Apr 13, 2026 11:00 | 3 days |
| Apr 4, 2026 12:00 | Apr 7, 2026 09:00 | 3 days |
| Jan 26, 2026 15:00 | Jan 28, 2026 14:00 | 47 hours |
| Jan 9, 2026 14:00 | Jan 11, 2026 11:00 | 45 hours |
Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.
Who is responsible
Air quality in the Federation of BiH is monitored by three networks of stations: the federal, the cantonal and the municipal one (Air Protection Act, Official Gazette FBiH 72/24, Art. 12 to 16).
- Federal Hydrometeorological Institute (FHMZ)
- Runs the federal network, collects the data of all networks and publishes it. It issues a report every month and, every year by 31 July, the annual air quality report (Art. 14, 19 and 63).
- Canton
- Sets up the cantonal network and is responsible for the measures. When limit values are exceeded, it adopts an air quality plan. When warning or alert thresholds are at risk of being exceeded, it adopts a short-term intervention plan. When the information threshold or a concentration dangerous to health is exceeded, it informs the public (Art. 15, 22, 25, 27 and 61). In Zenica-Doboj Canton the Ministry of Physical Planning, Transport, Communications and Environmental Protection is responsible for environmental protection. The 2024 intervention plan was adopted by the Government of the canton.
- Municipality
- May run its own stations with the consent of the canton and must publish their results (Art. 16 and 17). Under the Zenica-Doboj Canton intervention plan (Official Gazette ZDK 3/24, Art. 3), the mayor of the municipality or city declares readiness based on the report of the authorised expert institution, and warning and alert based on the decision of the operational headquarters.
- Inspectorates
- The inspectorates of the Federation, the canton and the municipality supervise the law and the measures, each within its remit (Art. 71).
What the law requires when a limit is exceeded
A limit value is not a recommendation. The deadline for meeting the limit values for sulphur dioxide, nitrogen dioxide and particulate matter expired on 1 January 2021. Since then only the number of exceedances that the Pravilnik allows applies (Official Gazette FBiH 1/12, Annex X). The Air Protection Act adds that limit values, once met, must not be exceeded again (Art. 5(4)).
The law allows: for PM10 at most 35 days a year above 50 µg/m³, for sulphur dioxide at most 24 hours above 350 µg/m³ and at most 3 days above 125 µg/m³, for nitrogen dioxide at most 18 hours above 200 µg/m³ and no day with a daily average above 85 µg/m³ (Annex X).
When limits are exceeded, the canton adopts an air quality plan with measures that shorten the period of exceedance. The plan is published within eight days of adoption (Art. 8, 25, 26 and 63).
The alert thresholds are 500 µg/m³ for sulphur dioxide and 400 µg/m³ for nitrogen dioxide over three hours in a row, and 300 µg/m³ for PM10 and 280 µg/m³ for PM2.5 as a daily average (Pravilnik, Annex XIV, amended in Official Gazette FBiH 3/21). When such a situation threatens, the canton must have a short-term intervention plan. It can restrict traffic, construction work, the operation of plants and heating (Art. 27 and 28).
When the information threshold or a concentration dangerous to health is exceeded, the competent cantonal authorities inform the public through radio, television, newspapers and the internet: where, since when, how much was measured, what is expected and how to protect oneself (Art. 61 and 62).
In Zenica-Doboj Canton the procedure is set by the intervention plan (Official Gazette ZDK 3/24) in three stages: readiness, warning and alert. An alert also requires a forecast of stable weather for the next 48 hours.
The canton also has an Action Plan for Air Quality Protection from 2020 (Official Gazette ZDK 9/20), adopted under the earlier law. We could not tell from the published decision how long it applies.
The limit values in BiH match the EU rules of 2008. Since 2021 the World Health Organization has recommended much lower values, for PM10 45 µg/m³ a day and 15 µg/m³ a year. From 2030 the EU lowers the annual PM10 limit to 20 µg/m³ (Directive (EU) 2024/2881).
We checked the rules against the published texts on 7 October 2026.
Where the data comes from
Measured by Federal Hydrometeorological Institute. We take the values from the European Environment Agency (EEA) under the CC BY 4.0 licence.
Values marked provisional have not been fully checked by the network yet. The EEA publishes verified data for the previous year once a year, usually by the end of September.
An hourly value is the average of one hour. We show the end of the hour: the value to 18:00 was measured from 17:00 to 18:00.
A day runs from midnight to midnight local time.
We only show an average when at least three out of four hours in the period have a reading. The EU air quality directive requires this for daily averages, and we apply the same rule to longer periods. We compare an annual average with the EU limit only once 90 % of hours are measured, as the directive requires. For 12 months and for a year we ask for more: if less than 90 % of hours are measured, every full calendar month needs readings for at least half of its hours. Otherwise a whole season could be missing from the average, such as summer, when ozone is highest.
We do not call a difference of up to 10 % a change, nor one of up to 1 µg/m³ at low levels, because weather and measurement uncertainty alone cause differences that size.
When a station sends no reading, the EEA sometimes fills the hour with a model estimate. We draw those hours dashed and leave them out of every average.
The limits are the legal limits of the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19 and 3/21, Annexes X and XIV). They match EU Directive 2008/50/EC. When more than a tenth of the days or hours are missing, the number of exceedances can only be higher, so we write “at least” in front of it.
Other stations in Zenica
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