Air at the Tesanj station
Tešanj, Zenica-Doboj Canton · Federation of Bosnia and Herzegovina
Network: Federal Hydrometeorological Institute · Station code: BA0056A
This year, up to the last reading (August 10)
at least
3 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 3 days more than allowed
at least
21 days
with an 8-hour average of ozone (O₃) above the target value of 120 µg/m³.
Readings are missing for part of the period, so the real number may be higher.
Worst day: January 13, 2026, NO₂ 105 µg/m³ as a daily average, 1.2 times the limit.
At least 1 day 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 7 hours above the legal hourly limit for NO₂ of 200 µg/m³ (too few readings to compare with the allowed number).
Also: at least 1 day above the legal daily limit for SO₂ of 125 µg/m³ (too few readings to compare with the allowed number).
Also: at least 11 days above the legal daily limit for PM10 of 50 µg/m³ (too few readings to compare with the allowed number).
Daily average for 106 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)
No data has arrived from this station since August 10, 2026 at 09:00
No reading for 58 days.
On the FHMZ website this station showed current hourly values on October 7, 2026. The data is just not reaching the EEA database, which is where we take it from. The station on the FHMZ website
This station is one of 5 stations in the Federation of BiH from which no data has been arriving since August 10, 2026. The data stopped at almost the same time. When data from several stations stops within a few hours, the cause is probably shared, for example in the data transmission. Where exactly, we cannot tell from here.
Last reading: August 10, 2026 at 09:00
Measured then: NO₂ 14.2 µg/m³, O₃ 74.5 µg/m³, PM10 32.2 µg/m³, PM2.5 14.7 µg/m³, SO₂ 12.3 µg/m³
Nearest station measuring now: Maglaj, about 12 km away.
That reading is from another place. Your air may be better or worse.
How the air is changing
There are not enough readings to compare with the week before.
- PM10: too few readings to compare
- PM2.5: too few readings to compare
- NO₂: too few readings to compare
- O₃: too few readings to compare
- SO₂: too few readings to compare
There are not enough readings to compare with the month before.
- PM10: too few readings to compare
- PM2.5: 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
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 0 % of hours
too few readings
Last 12 months
measured in 45 % of hours · provisional
Days in 2024: PM10, daily average above 50 µg/m³
22 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 (22)
- Jan 12 67
- Jan 14 79
- Jan 15 57
- Jan 22 65
- Jan 23 59
- Jan 24 64
- Jan 26 63
- Jan 29 57
- Jan 30 66
- Jan 31 86
- Feb 1 109
- Feb 4 63
- Feb 5 86
- Feb 6 51
- Sep 3 52
- Sep 4 126
- Sep 5 76
- Dec 27 81
- Dec 28 121
- Dec 29 95
- Dec 30 102
- Dec 31 125
Values in µg/m³, limit 50 µg/m³.
Months of 2024
| Month | Days above 50 | Highest day | No readings |
|---|---|---|---|
| January | 10 above the number allowed | 86 | 0 |
| February | 4 above the number allowed | 109 | 0 |
| March | 0 | 41 | 0 |
| April | 0 | 21 | 0 |
| May | 0 | 13 | 0 |
| June | 0 | 34 | 0 |
| July | 0 | 31 | 0 |
| August | 0 | 38 | 0 |
| September | 3 above the number allowed | 126 | 0 |
| October | 0 | 47 | 0 |
| November | 0 | 43 | 0 |
| December | 5 above the number allowed | 125 | 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.
There are no readings for this period.
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no data from the station | |
| Mon, 10/5 | no data from the station | |
| Sun, 10/4 | no data from the station | |
| Sat, 10/3 | no data from the station | |
| Fri, 10/2 | no data from the station | |
| Thu, 10/1 | no data from the station | |
| Wed, 9/30 | no data from the station | |
| Tue, 9/29 | no data from the station | |
| Mon, 9/28 | no data from the station | |
| Sun, 9/27 | no data from the station | |
| Sat, 9/26 | no data from the station | |
| Fri, 9/25 | no data from the station | |
| Thu, 9/24 | no data from the station | |
| Wed, 9/23 | no data from the station | |
| Tue, 9/22 | no data from the station | |
| 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 | 6 days without data from the station | |
| September 2026 | too few readings | 30 days without data from the station | |
| August 2026 | too few readings | measured in 30 % of hours · provisional · 21 days without data from the station | |
| July 2026 | 16.8 | measured in 95 % of hours · provisional | |
| June 2026 | too few readings | measured in 18 % of hours · provisional · 1 day without data from the station | |
| May 2026 | too few readings | measured in 37 % of hours · provisional | |
| April 2026 | 2.8 | measured in 79 % of hours · provisional · 4 days without data from the station | |
| March 2026 | 7.2 | measured in 94 % of hours · provisional | |
| February 2026 | 5.5 | measured in 100 % of hours · provisional | |
| January 2026 | 51.9 | measured in 88 % of hours · provisional · 2 days without data from the station | |
| December 2025 | too few readings | too few readings | 31 days without data from the station |
| November 2025 | too few readings | too few readings | 30 days without data from the station |
PM10 by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2024 | 2023 |
|---|---|---|---|
| Days above 50 µg/m³ (allowed 35) | ≥ 11² | 22 | 45 above the number allowed |
| Days above 150 µg/m³ (warning threshold FBiH) | ≥ 1 above the number allowed | 0 | 0 |
| Days above 300 µg/m³ (alert threshold FBiH) | 0 | 0 | 0 |
| Annual average, µg/m³ (legal limit 40) | too few | too few | 24.9 |
| Highest daily average, µg/m³ | 157January 23 | 126September 4 | 141December 29 |
| Highest hourly value, µg/m³ | 270January 23 | 399September 4 | 297January 2 |
| Hours measured | 59 % | 83 % | 98 % |
| Days without any reading from the station | 64 | 0 | 4 |
* 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.
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.
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 2024 there were 30 such days.
- WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2024 there were 30 such days.
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 2024
| Day | Average | Times the limit |
|---|---|---|
| Sep 4, 2024 | 126 | 2.5 × |
| Dec 31, 2024 | 125 | 2.5 × |
| Dec 28, 2024 | 121 | 2.4 × |
| Feb 1, 2024 | 109 | 2.2 × |
| Dec 30, 2024 | 102 | 2.0 × |
Daily average in µg/m³, daily limit 50 µg/m³. Days with the same unverified value over many hours are not on this list.
Particulate matter PM2.5
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 0 % of hours
too few readings
Last 12 months
measured in 38 % of hours · provisional
There are no readings for this period.
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no data from the station | |
| Mon, 10/5 | no data from the station | |
| Sun, 10/4 | no data from the station | |
| Sat, 10/3 | no data from the station | |
| Fri, 10/2 | no data from the station | |
| Thu, 10/1 | no data from the station | |
| Wed, 9/30 | no data from the station | |
| Tue, 9/29 | no data from the station | |
| Mon, 9/28 | no data from the station | |
| Sun, 9/27 | no data from the station | |
| Sat, 9/26 | no data from the station | |
| Fri, 9/25 | no data from the station | |
| Thu, 9/24 | no data from the station | |
| Wed, 9/23 | no data from the station | |
| Tue, 9/22 | no data from the station | |
| 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 | 6 days without data from the station | |
| September 2026 | too few readings | 30 days without data from the station | |
| August 2026 | too few readings | measured in 30 % of hours · provisional · 21 days without data from the station | |
| July 2026 | 9.8 | measured in 95 % of hours · provisional | |
| June 2026 | too few readings | measured in 18 % of hours · provisional · 1 day without data from the station | |
| May 2026 | too few readings | measured in 37 % of hours · provisional | |
| April 2026 | 2.7 | measured in 79 % of hours · provisional · 4 days without data from the station | |
| March 2026 | 7.1 | measured in 94 % of hours · provisional | |
| February 2026 | 5.4 | measured in 100 % of hours · provisional | |
| January 2026 | too few readings | measured in 11 % of hours · provisional · 2 days without data from the station | |
| December 2025 | too few readings | 31 days without data from the station | |
| November 2025 | too few readings | 30 days without data from the station |
PM2.5 by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* |
|---|---|
| Days above 140 µg/m³ (warning threshold FBiH) | 0 |
| Days above 280 µg/m³ (alert threshold FBiH) | 0 |
| Annual average, µg/m³ (legal limit 25) | too few |
| Highest daily average, µg/m³ | 22June 29 |
| Highest hourly value, µg/m³ | 51March 8 |
| Hours measured | 50 % |
| Days without any reading from the station | 64 |
* 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.
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.
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 0 % of hours
too few readings
Last 12 months
measured in 38 % of hours · provisional
Days in 2024: 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 2024
| Month | Days above 85 | Hours above 200 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 0 | |
| February | 0 | 0 | 43 | 0 |
| March | 0 | 0 | 28 | 0 |
| April | 0 | 0 | 23 | 0 |
| May | 0 | 0 | 11 | 0 |
| June | 0 | 0 | 6 | 0 |
| July | 0 | 0 | 11 | 0 |
| August | 0 | 0 | 13 | 0 |
| September | 0 | 0 | 15 | 0 |
| October | 0 | 0 | 19 | 0 |
| November | 0 | |||
| December | 0 | 0 | 55 | 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.
There are no readings for this period.
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no data from the station | |
| Mon, 10/5 | no data from the station | |
| Sun, 10/4 | no data from the station | |
| Sat, 10/3 | no data from the station | |
| Fri, 10/2 | no data from the station | |
| Thu, 10/1 | no data from the station | |
| Wed, 9/30 | no data from the station | |
| Tue, 9/29 | no data from the station | |
| Mon, 9/28 | no data from the station | |
| Sun, 9/27 | no data from the station | |
| Sat, 9/26 | no data from the station | |
| Fri, 9/25 | no data from the station | |
| Thu, 9/24 | no data from the station | |
| Wed, 9/23 | no data from the station | |
| Tue, 9/22 | no data from the station | |
| 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 | 6 days without data from the station | |
| September 2026 | too few readings | 30 days without data from the station | |
| August 2026 | too few readings | measured in 30 % of hours · provisional · 21 days without data from the station | |
| July 2026 | 7.4 | measured in 95 % of hours · provisional | |
| June 2026 | too few readings | measured in 28 % of hours · provisional · 1 day without data from the station | |
| May 2026 | too few readings | measured in 26 % of hours · provisional | |
| April 2026 | too few readings | measured in 47 % of hours · provisional · 4 days without data from the station | |
| March 2026 | too few readings | measured in 73 % of hours · provisional | |
| February 2026 | too few readings | measured in 72 % of hours · provisional | |
| January 2026 | 33.7 | measured in 85 % of hours · provisional · 2 days without data from the station | |
| December 2025 | too few readings | too few readings | 31 days without data from the station |
| November 2025 | too few readings | 30 days without data from the station |
NO₂ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2024 | 2023 |
|---|---|---|---|
| Days above 85 µg/m³ (none allowed) | ≥ 3 above the number allowed | 0² | 0² |
| Hours above 200 µg/m³ (allowed 18) | ≥ 7² | 0² | 0² |
| Hours above 400 µg/m³, three hours in a row (alert threshold) | 0 | 0 | 0 |
| Annual average, µg/m³ (legal limit 40) | too few | too few | too few |
| Highest daily average, µg/m³ | 105January 13 | 55December 30 | 40February 12 |
| Highest hourly value, µg/m³ | 270January 16 | 100December 28 | 87February 17 |
| Hours measured | 50 % | 59 % | 77 % |
| Days without any reading from the station | 64 | 0 | 4 |
* 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.
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 2024 there were 3 such days.
- WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2024 there were 16 such days.
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
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 0 % of hours
too few readings
Last 12 months
measured in 56 % of hours · provisional
Days in 2024: O₃, 8-hour average above 120 µg/m³
17 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 (17)
- May 7 227
- May 8 448
- May 9 470
- May 10 482
- May 11 472
- May 12 515
- Jun 1 122
- Jun 6 122
- Jun 7 131
- Jun 8 148
- Jun 18 134
- Aug 14 134
- Aug 25 164
- Sep 22 142
- Sep 23 123
- Sep 26 128
- Sep 27 134
Values in µg/m³, limit 120 µg/m³.
Months of 2024
| Month | Days above 120 | Highest 8 h | No readings |
|---|---|---|---|
| January | 0 | 74 | 0 |
| February | 0 | 95 | 0 |
| March | 0 | 90 | 0 |
| April | 0 | 96 | 0 |
| May | 6 above the number allowed | 515 | 0 |
| June | 5 above the number allowed | 148 | 0 |
| July | 0 | 119 | 0 |
| August | 2 above the number allowed | 164 | 0 |
| September | 4 above the number allowed | 142 | 0 |
| October | 0 | 113 | 0 |
| November | 0 | 97 | 0 |
| December | 0 | 82 | 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.
There are no readings for this period.
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no data from the station | |
| Mon, 10/5 | no data from the station | |
| Sun, 10/4 | no data from the station | |
| Sat, 10/3 | no data from the station | |
| Fri, 10/2 | no data from the station | |
| Thu, 10/1 | no data from the station | |
| Wed, 9/30 | no data from the station | |
| Tue, 9/29 | no data from the station | |
| Mon, 9/28 | no data from the station | |
| Sun, 9/27 | no data from the station | |
| Sat, 9/26 | no data from the station | |
| Fri, 9/25 | no data from the station | |
| Thu, 9/24 | no data from the station | |
| Wed, 9/23 | no data from the station | |
| Tue, 9/22 | no data from the station | |
| 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 | 6 days without data from the station | |
| September 2026 | too few readings | 30 days without data from the station | |
| August 2026 | too few readings | measured in 30 % of hours · provisional · 21 days without data from the station | |
| July 2026 | 82 | measured in 95 % of hours · provisional | |
| June 2026 | 68.4 | measured in 92 % of hours · provisional · 1 day without data from the station | |
| May 2026 | 76.3 | measured in 94 % of hours · provisional | |
| April 2026 | 64.3 | measured in 79 % of hours · provisional · 4 days without data from the station | |
| March 2026 | 62.4 | measured in 94 % of hours · provisional | |
| February 2026 | 48 | measured in 100 % of hours · provisional | |
| January 2026 | 31 | measured in 88 % of hours · provisional · 2 days without data from the station | |
| December 2025 | too few readings | 21.7 | 31 days without data from the station |
| November 2025 | too few readings | 30.9 | 30 days without data from the station |
O₃ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2024 | 2023 |
|---|---|---|---|
| Days with 8-hour average above 120 µg/m³ (target value 25) | ≥ 21² | 17 | 19 |
| Annual average, µg/m³ | too few | 53.9¹ | 51.1 |
| Highest 8-hour average, µg/m³ | 181July 18 | 515May 12 | 275August 23 |
| Hours measured | 73 % | 86 % | 95 % |
| Days without any reading from the station | 64 | 0 | 4 |
* 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.
¹ Fewer than 90 % of the hours were measured, so we do not compare this average with the limit.
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 worst days of 2024
| Day | Highest 8 h | Times the limit |
|---|---|---|
| May 12, 2024 | 515 | 4.3 × |
| May 10, 2024 | 482 | 4.0 × |
| May 11, 2024 | 472 | 3.9 × |
| May 9, 2024 | 470 | 3.9 × |
| May 8, 2024 | 448 | 3.7 × |
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
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 0 % of hours
too few readings
Last 12 months
measured in 19 % of hours · provisional
Days in 2024: SO₂, daily average above 125 µg/m³
7 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 (7)
- Jan 22 132
- Feb 1 128
- Dec 27 160
- Dec 28 221
- Dec 29 394
- Dec 30 402
- Dec 31 248
Values in µg/m³, limit 125 µg/m³.
Months of 2024
| Month | Days above 125 | Hours above 350 | Highest day | No readings |
|---|---|---|---|---|
| January | 1 above the number allowed | 0 | 132 | 0 |
| February | 1 above the number allowed | 1 | 128 | 0 |
| March | 0 | 0 | 73 | 0 |
| April | 0 | 0 | 41 | 0 |
| May | 0 | 0 | 22 | 0 |
| June | 0 | 0 | 13 | 0 |
| July | 0 | 0 | 14 | 0 |
| August | 0 | 0 | 35 | 0 |
| September | 0 | 0 | 25 | 0 |
| October | 0 | 0 | 33 | 0 |
| November | 0 | 0 | 110 | 0 |
| December | 5 above the number allowed | 29 | 402 | 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.
There are no readings for this period.
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | no data from the station | |
| Mon, 10/5 | no data from the station | |
| Sun, 10/4 | no data from the station | |
| Sat, 10/3 | no data from the station | |
| Fri, 10/2 | no data from the station | |
| Thu, 10/1 | no data from the station | |
| Wed, 9/30 | no data from the station | |
| Tue, 9/29 | no data from the station | |
| Mon, 9/28 | no data from the station | |
| Sun, 9/27 | no data from the station | |
| Sat, 9/26 | no data from the station | |
| Fri, 9/25 | no data from the station | |
| Thu, 9/24 | no data from the station | |
| Wed, 9/23 | no data from the station | |
| Tue, 9/22 | no data from the station | |
| 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 | 6 days without data from the station | |
| September 2026 | too few readings | 30 days without data from the station | |
| August 2026 | too few readings | measured in 30 % of hours · provisional · 21 days without data from the station | |
| July 2026 | 5.7 | measured in 95 % of hours · provisional | |
| June 2026 | too few readings | measured in 18 % of hours · provisional · 1 day without data from the station | |
| May 2026 | too few readings | ||
| April 2026 | too few readings | 4 days without data from the station | |
| March 2026 | too few readings | ||
| February 2026 | too few readings | ||
| January 2026 | 52.9 | measured in 77 % of hours · provisional · 2 days without data from the station | |
| December 2025 | too few readings | 85.5 | 31 days without data from the station |
| November 2025 | too few readings | 41.9 | 30 days without data from the station |
SO₂ by year
Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)
| Measure | 2026* | 2024 | 2023 |
|---|---|---|---|
| Days above 125 µg/m³ (allowed 3) | ≥ 1² | 7 above the number allowed | ≥ 10 above the number allowed |
| Hours above 350 µg/m³ (allowed 24) | 0² | ≥ 30 above the number allowed | 0² |
| Hours above 500 µg/m³, three hours in a row (alert threshold) | 0 | ≥ 11 above the number allowed | 0 |
| Annual average, µg/m³ (legal limit 50) | too few | 28.5¹ | too few |
| Highest daily average, µg/m³ | 134January 23 | 402December 30 | 169January 7 |
| Highest hourly value, µg/m³ | 348January 23 | 741December 29 | 291January 7 |
| Hours measured | 24 % | 90 % | 61 % |
| Days without any reading from the station | 64 | 0 | 4 |
* 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.
¹ Fewer than 90 % of the hours were measured, so we do not compare this average with the limit.
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.
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 2024 there were 56 such days.
- WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2024 there were 73 such days.
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 2024
| Day | Average | Times the limit |
|---|---|---|
| Dec 30, 2024 | 402 | 3.2 × |
| Dec 29, 2024 | 394 | 3.2 × |
| Dec 31, 2024 | 248 | 2.0 × |
| Dec 28, 2024 | 221 | 1.8 × |
| Dec 27, 2024 | 160 | 1.3 × |
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: 74
9 outages, 1,787 hours in total in the last 12 months.
Timeline of outages from October 7, 2025 to today
Grey: for 2025 the archive has no hour from this station, because the EEA's verified annual delivery does not include it. We do not count this as an outage.
| From | To | Duration |
|---|---|---|
| Aug 10, 2026 09:00 | still ongoing | 58 days |
| Jul 1, 2026 09:00 | Jul 2, 2026 09:00 | 24 hours |
| Jun 9, 2026 05:00 | Jun 11, 2026 16:00 | 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 |
| Mar 29, 2026 07:00 | Mar 30, 2026 13:00 | 30 hours |
| 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.
samoEKO is a brand of samoLabs, Juelich.