Air at the Skver - MS1 station
Tuzla, Tuzla Canton · Federation of Bosnia and Herzegovina
Network: Federal Hydrometeorological Institute · Station code: BA0031A
This year, up to yesterday (October 6)
at least
2 days
with a daily average of sulphur dioxide (SO₂) above the legal limit of 125 µg/m³.
Readings are missing for part of the period, so the real number may be higher.
at least
13 hours
with sulphur dioxide (SO₂) above the legal hourly limit of 350 µg/m³.
Readings are missing for part of the period, so the real number may be higher.
Worst day: January 21, 2026, SO₂ 356 µg/m³ as a daily average, 2.9 times the limit.
SO₂ was above the alert threshold of 500 µg/m³ for at least 8 hours, three or more hours in a row (on 1 day).
At least 3 days with a daily average of PM2.5 above 140 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.
Daily average for 179 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)
Moderate
Air now · Measured at 19:00
Latest values
Latest value: 19:00
| Pollutant | Value | Level |
|---|---|---|
| PM10 | 77.3 µg/m³ | Moderate |
| SO₂ | 30.1 µg/m³ | Fair |
How the air is changing
Over the last seven days there was less PM2.5 in the air than the week before.
- PM10: too few readings to compare
- PM2.5: average 21 µg/m³, week before 41.7 µg/m³
- NO₂: too few readings to compare
- O₃: too few readings to compare
- SO₂: average 20.6 µg/m³, week before 22 µg/m³
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
77.3
Nowµg/m³
Measured at 19:00
37.7
Last 24 hoursµg/m³
measured in 88 % of hours · provisional
26.7
Last 7 daysµg/m³
measured in 89 % of hours · provisional
too few readings
Last 30 days
measured in 21 % of hours · provisional
too few readings
Last 12 months
measured in 2 % of hours · provisional
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 21:00 | 68 | model estimate, not counted |
| 20:00 | 72 | model estimate, not counted |
| 19:00 | 77.3 | |
| 18:00 | 61.2 | |
| 17:00 | 20.7 | |
| 16:00 | 19.6 | |
| 15:00 | 16.5 | |
| 14:00 | 14.7 | |
| 13:00 | 25.7 | |
| 12:00 | 66.6 | |
| 11:00 | 51.8 | |
| 10:00 | 45.5 | |
| 09:00 | 44.6 | |
| 08:00 | 38.1 | |
| 07:00 | 37.3 | |
| 06:00 | 42.8 | |
| 05:00 | 23.9 | |
| 04:00 | 24.2 | |
| 03:00 | 26 | |
| 02:00 | 32.9 | |
| 01:00 | 35.9 | |
| Tuesday, 10/6 | ||
| 00:00 | 30.2 | |
| 23:00 | 56.2 | |
| 22:00 | 69.9 | |
| 21:00 | 63.1 | |
| 20:00 | 59.8 | |
| 19:00 | 49.2 | |
| 18:00 | 26.9 | |
| 17:00 | 21.9 | |
| 16:00 | 18 | |
| 15:00 | 14.2 | |
| 14:00 | 19.3 | |
| 13:00 | 36.2 | |
| 12:00 | 38.6 | |
| 11:00 | 46.1 | |
| 10:00 | 49 | |
| 09:00 | 43.4 | |
| 08:00 | 34.8 | |
| 07:00 | 27.8 | |
| 06:00 | 21.5 | |
| 05:00 | 23 | |
| 04:00 | 21.4 | |
| 03:00 | 23.6 | |
| 02:00 | 28.9 | |
| 01:00 | 34 | |
| Monday, 10/5 | ||
| 00:00 | 27.1 | |
| 23:00 | 42.2 | |
| 22:00 | 51.9 | |
| 21:00 | 48 | |
| 20:00 | 42.4 | |
| 19:00 | 28.6 | |
| 18:00 | 17.8 | |
| 16:00 | 18.2 | |
| 15:00 | 17.9 | |
| 14:00 | 20.4 | |
| 13:00 | 19.4 | |
| 12:00 | 27.7 | |
| 11:00 | 32 | |
| 10:00 | 33.6 | |
| 09:00 | 34.3 | |
| 08:00 | 42.6 | |
| 07:00 | 28.6 | |
| 06:00 | 38.5 | |
| 05:00 | 16.3 | |
| 04:00 | 17.1 | |
| 03:00 | 20.4 | |
| 02:00 | 25.1 | |
| 01:00 | 28.3 | |
| Sunday, 10/4 | ||
| 00:00 | 25.9 | |
| 23:00 | 46.2 | |
| 22:00 | 54.7 | |
| 21:00 | 49.7 | |
| 20:00 | 51.9 | |
| 19:00 | 52.1 | |
| 18:00 | 12.6 | |
| 17:00 | 14.5 | |
| 16:00 | 15.1 | |
| 15:00 | 15 | |
| 14:00 | 15.2 | |
| 13:00 | 19.6 | |
| 12:00 | 21.9 | |
| 11:00 | 18.8 | |
| 10:00 | 23.4 | |
| 09:00 | 20 | |
| 08:00 | 18.6 | |
| 07:00 | 16.8 | |
| 06:00 | 15.2 | |
| 05:00 | 16.9 | |
| 04:00 | 21.4 | |
| 03:00 | 21.7 | |
| 02:00 | 22.7 | |
| 01:00 | 29.4 | |
| Saturday, 10/3 | ||
| 00:00 | 29.2 | |
| 23:00 | 43.7 | |
| 22:00 | 49.5 | |
| 21:00 | 58.8 | |
| 20:00 | 53.5 | |
| 19:00 | 20.6 | |
| 18:00 | 14.6 | |
| 17:00 | 18.4 | |
| 16:00 | 14.2 | |
| 15:00 | 14.6 | |
| 14:00 | 11.6 | |
| 13:00 | 11.3 | |
| 12:00 | 20.3 | |
| 11:00 | 31.2 | |
| 10:00 | 31.8 | |
| 09:00 | 23.1 | |
| 08:00 | 20.1 | |
| 07:00 | 18.2 | |
| 06:00 | 17 | |
| 05:00 | 15.3 | |
| 04:00 | 17.4 | |
| 03:00 | 21.3 | |
| 02:00 | 26.7 | |
| 01:00 | 32.9 | |
| Friday, 10/2 | ||
| 00:00 | 29.3 | |
| 23:00 | 46.4 | |
| 22:00 | 66.1 | |
| 21:00 | 64.7 | |
| 20:00 | 39.8 | |
| 19:00 | 19 | |
| 18:00 | 14.6 | |
| 17:00 | 12.7 | |
| 16:00 | 10.4 | |
| 15:00 | 9.5 | |
| 14:00 | 9.3 | |
| 13:00 | 11.4 | |
| 12:00 | 25.3 | |
| 11:00 | 22.6 | |
| 10:00 | 38.3 | |
| 09:00 | 30.9 | |
| 08:00 | 25.1 | |
| 07:00 | 15.4 | |
| 06:00 | 10.9 | |
| 05:00 | 10.8 | |
| 04:00 | 12.6 | |
| 03:00 | 14.2 | |
| 02:00 | 15.9 | |
| 01:00 | 24.3 | |
| Thursday, 10/1 | ||
| 00:00 | 19.7 | |
| 23:00 | 32 | |
| 22:00 | 31.3 | |
| 21:00 | 32.5 | |
| 20:00 | 19.2 | |
| 19:00 | 19 | |
| 18:00 | 20.6 | |
| 17:00 | 12.4 | |
| 16:00 | 11.6 | |
| 15:00 | 12 | |
| 14:00 | 10.2 | |
| 13:00 | 10.1 | |
| 12:00 | 11.2 | |
| 11:00 | 14 | |
| 10:00 | 35.4 | |
| 09:00 | 34.4 | |
| 08:00 | 26.4 | |
| 07:00 | 51.5 | |
| 06:00 | 14.5 | |
| 05:00 | 14.2 | |
| 04:00 | 13.3 | |
| 03:00 | 13.8 | |
| 02:00 | 16.1 | |
| 01:00 | 18.8 | |
| Wednesday, 9/30 | ||
| 00:00 | 14.4 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 35.7 | provisional |
| Mon, 10/5 | 29.5 | provisional |
| Sun, 10/4 | 25.8 | provisional |
| Sat, 10/3 | 25.6 | provisional |
| Fri, 10/2 | 24.1 | provisional |
| Thu, 10/1 | 20.6 | provisional |
| Wed, 9/30 | too few readings | |
| Tue, 9/29 | no measurement | |
| Mon, 9/28 | no measurement | |
| Sun, 9/27 | no measurement | |
| Sat, 9/26 | no measurement | |
| Fri, 9/25 | no measurement | |
| Thu, 9/24 | no measurement | |
| Wed, 9/23 | no measurement | |
| Tue, 9/22 | no measurement | |
| 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 | 26.9 | measured in 99 % of hours · provisional | |
| September 2026 | too few readings | measured in 1 % of hours · provisional · 20 days without data from the station | |
| August 2026 | too few readings | 10 days without data from the station | |
| July 2026 | too few readings | 13 days without data from the station | |
| June 2026 | too few readings | 10 days without data from the station | |
| May 2026 | too few readings | 3 days without data from the station | |
| April 2026 | too few readings | 16 days without data from the station | |
| March 2026 | too few readings | 3 days without data from the station | |
| February 2026 | too few readings | ||
| January 2026 | too few readings | 6 days without data from the station | |
| December 2025 | too few readings | ||
| November 2025 | too few readings | 3 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* |
|---|---|
| Days above 50 µg/m³ (allowed 35) | 0² |
| Days above 150 µg/m³ (warning threshold FBiH) | 0 |
| Days above 300 µg/m³ (alert threshold FBiH) | 0 |
| Annual average, µg/m³ (legal limit 40) | too few |
| Highest daily average, µg/m³ | 36October 6 |
| Highest hourly value, µg/m³ | 70October 6 |
| Hours measured | 2 % |
| Days without any reading from the station | 81 |
* 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.
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.
Particulate matter PM2.5
no measurement
Now
too few readings
Last 24 hours
measured in 0 % of hours
21
Last 7 daysµg/m³
measured in 98 % of hours · provisional
too few readings
Last 30 days
measured in 46 % of hours · provisional
too few readings
Last 12 months
measured in 71 % of hours · provisional
Months of 2025
| Month | Highest day | No readings |
|---|---|---|
| January | 24 | 3 |
| February | 50 | 0 |
| March | 56 | 0 |
| April | 53 | 1 |
| May | 18 | 0 |
| June | 38 | 0 |
| July | 13 | 12 |
| August | 70 | 15 |
| September | 48 | 0 |
| October | 75 | 0 |
| November | 85 | 3 |
| December | 189 | 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 |
|---|---|---|
| Tuesday, 10/6 | ||
| 22:00 | 52.1 | |
| 21:00 | 42.2 | |
| 20:00 | 39.9 | |
| 19:00 | 31.7 | |
| 18:00 | 13.2 | |
| 17:00 | 12.2 | |
| 16:00 | 11.8 | |
| 15:00 | 9 | |
| 14:00 | 11.9 | |
| 13:00 | 19.5 | |
| 12:00 | 22.4 | |
| 11:00 | 26.9 | |
| 10:00 | 29.5 | |
| 09:00 | 28.1 | |
| 08:00 | 22 | |
| 07:00 | 18.6 | |
| 06:00 | 16.8 | |
| 05:00 | 18.1 | |
| 04:00 | 16.5 | |
| 03:00 | 18 | |
| 02:00 | 22.3 | |
| 01:00 | 26.1 | |
| Monday, 10/5 | ||
| 00:00 | 27.1 | |
| 23:00 | 29.5 | |
| 22:00 | 37 | |
| 21:00 | 32.1 | |
| 20:00 | 27.8 | |
| 19:00 | 16.7 | |
| 18:00 | 9.4 | |
| 17:00 | 109.7 | |
| 16:00 | 10.1 | |
| 15:00 | 10.1 | |
| 14:00 | 11.4 | |
| 13:00 | 11.2 | |
| 12:00 | 15.6 | |
| 11:00 | 19.8 | |
| 10:00 | 22 | |
| 09:00 | 21.7 | |
| 08:00 | 29.4 | |
| 07:00 | 19.6 | |
| 06:00 | 33.9 | |
| 05:00 | 11.9 | |
| 04:00 | 12.8 | |
| 03:00 | 15.8 | |
| 02:00 | 19.5 | |
| 01:00 | 21.8 | |
| Sunday, 10/4 | ||
| 00:00 | 35 | |
| 23:00 | 35.2 | |
| 22:00 | 43.3 | |
| 21:00 | 37 | |
| 20:00 | 37.3 | |
| 19:00 | 37.5 | |
| 18:00 | 5.8 | |
| 17:00 | 7.1 | |
| 16:00 | 8 | |
| 15:00 | 8.8 | |
| 14:00 | 8.8 | |
| 13:00 | 11.6 | |
| 12:00 | 14.1 | |
| 11:00 | 11 | |
| 10:00 | 14.9 | |
| 09:00 | 13.6 | |
| 08:00 | 12.2 | |
| 07:00 | 11.3 | |
| 06:00 | 11 | |
| 05:00 | 12.5 | |
| 04:00 | 16.3 | |
| 03:00 | 16.5 | |
| 02:00 | 16.8 | |
| 01:00 | 21.8 | |
| Saturday, 10/3 | ||
| 00:00 | 24.5 | |
| 23:00 | 32.3 | |
| 22:00 | 36.6 | |
| 21:00 | 43.3 | |
| 20:00 | 40.7 | |
| 19:00 | 11 | |
| 18:00 | 6.4 | |
| 17:00 | 6.1 | |
| 16:00 | 6.6 | |
| 15:00 | 7.3 | |
| 14:00 | 5.5 | |
| 13:00 | 5.1 | |
| 12:00 | 10.4 | |
| 11:00 | 19.9 | |
| 10:00 | 20.4 | |
| 09:00 | 15.1 | |
| 08:00 | 12.5 | |
| 07:00 | 11 | |
| 06:00 | 12.4 | |
| 05:00 | 11.7 | |
| 04:00 | 13.1 | |
| 03:00 | 16.2 | |
| 02:00 | 20 | |
| 01:00 | 23 | |
| Friday, 10/2 | ||
| 00:00 | 5.7 | |
| 23:00 | 36.7 | |
| 22:00 | 51.5 | |
| 21:00 | 46.1 | |
| 20:00 | 22.7 | |
| 19:00 | 7.9 | |
| 18:00 | 6 | |
| 17:00 | 5.5 | |
| 16:00 | 5 | |
| 15:00 | 4.6 | |
| 14:00 | 4.5 | |
| 13:00 | 5.5 | |
| 12:00 | 12.2 | |
| 11:00 | 11.4 | |
| 10:00 | 19.7 | |
| 09:00 | 16.8 | |
| 08:00 | 14.1 | |
| 07:00 | 8.2 | |
| 06:00 | 6.8 | |
| 05:00 | 7.1 | |
| 04:00 | 8.3 | |
| 03:00 | 9.3 | |
| 02:00 | 10.7 | |
| 01:00 | 17.6 | |
| Thursday, 10/1 | ||
| 00:00 | 11.9 | |
| 23:00 | 22 | |
| 22:00 | 20.3 | |
| 21:00 | 19.4 | |
| 20:00 | 8.1 | |
| 19:00 | 5.5 | |
| 18:00 | 5.2 | |
| 17:00 | 5.2 | |
| 16:00 | 4.9 | |
| 15:00 | 5.7 | |
| 14:00 | 5.1 | |
| 13:00 | 5 | |
| 12:00 | 5.6 | |
| 11:00 | 7 | |
| 10:00 | 19.8 | |
| 09:00 | 19 | |
| 08:00 | 15.8 | |
| 07:00 | 43.8 | |
| 06:00 | 9.9 | |
| 05:00 | 9.3 | |
| 04:00 | 9.1 | |
| 03:00 | 9.4 | |
| 02:00 | 11.2 | |
| 01:00 | 12.8 | |
| Wednesday, 9/30 | ||
| 00:00 | 24 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 23.1 | provisional |
| Mon, 10/5 | 24 | provisional |
| Sun, 10/4 | 18.6 | provisional |
| Sat, 10/3 | 17.1 | provisional |
| Fri, 10/2 | 14.3 | provisional |
| Thu, 10/1 | 12.1 | provisional |
| Wed, 9/30 | 38.7 | provisional |
| Tue, 9/29 | 42.4 | provisional |
| Mon, 9/28 | 47.9 | provisional |
| Sun, 9/27 | 37.7 | provisional |
| Sat, 9/26 | 31.2 | provisional |
| Fri, 9/25 | 37.1 | provisional |
| Thu, 9/24 | 55.3 | provisional |
| Wed, 9/23 | too few readings | |
| 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 | 18.2 | measured in 99 % of hours · provisional | |
| September 2026 | too few readings | too few readings | measured in 28 % of hours · provisional · 20 days without data from the station |
| August 2026 | too few readings | too few readings | measured in 66 % of hours · provisional · 10 days without data from the station |
| July 2026 | too few readings | too few readings | measured in 54 % of hours · provisional · 13 days without data from the station |
| June 2026 | too few readings | 15.6 | measured in 65 % of hours · provisional · 10 days without data from the station |
| May 2026 | 12.4 | 13.1 | measured in 87 % of hours · provisional · 3 days without data from the station |
| April 2026 | too few readings | 22.4 | measured in 40 % of hours · provisional · 16 days without data from the station |
| March 2026 | 40 | too few readings | measured in 88 % of hours · provisional · 3 days without data from the station |
| February 2026 | 44.6 | too few readings | measured in 100 % of hours · provisional |
| January 2026 | too few readings | too few readings | measured in 73 % of hours · provisional · 6 days without data from the station |
| December 2025 | 84.1 | measured in 90 % of hours · verified | |
| November 2025 | 49.6 | too few readings | measured in 78 % of hours · verified · 3 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* | 2025 | 2024 |
|---|---|---|---|
| Days above 140 µg/m³ (warning threshold FBiH) | ≥ 3 above the number allowed | ≥ 2 above the number allowed | 0 |
| Days above 280 µg/m³ (alert threshold FBiH) | 0 | 0 | 0 |
| Annual average, µg/m³ (legal limit 25) | too few | too few | too few |
| Highest daily average, µg/m³ | 214January 23 | 189December 17 | 139January 15 |
| Highest hourly value, µg/m³ | 336January 23 | 427December 16 | 311February 1 |
| Hours measured | 67 % | 70 % | 77 % |
| Days without any reading from the station | 81 | 34 | 10 |
* 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.
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 25 µg/m³, 18 days allowed. In 2025 there were 99 such days.
- WHO 2021: daily 15 µg/m³, at most three to four days a year. In 2025 there were 150 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.
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 0 % of hours
There are no readings for this period.
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 | no measurement | |
| Mon, 9/28 | no measurement | |
| Sun, 9/27 | no measurement | |
| Sat, 9/26 | no measurement | |
| Fri, 9/25 | no measurement | |
| Thu, 9/24 | no measurement | |
| Wed, 9/23 | no measurement | |
| Tue, 9/22 | no measurement | |
| 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 | ||
| September 2026 | too few readings | 20 days without data from the station | |
| August 2026 | too few readings | 10 days without data from the station | |
| July 2026 | too few readings | 13 days without data from the station | |
| June 2026 | too few readings | 10 days without data from the station | |
| May 2026 | too few readings | 3 days without data from the station | |
| April 2026 | too few readings | 16 days without data from the station | |
| March 2026 | too few readings | 3 days without data from the station | |
| February 2026 | too few readings | ||
| January 2026 | too few readings | 6 days without data from the station | |
| December 2025 | too few readings | 34.1 | |
| November 2025 | too few readings | too few readings | 3 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 | 2024 | 2023 |
|---|---|---|
| Days above 85 µg/m³ (none allowed) | 0 | 0 |
| Hours above 200 µg/m³ (allowed 18) | 0 | 0 |
| Hours above 400 µg/m³, three hours in a row (alert threshold) | 0 | 0 |
| Annual average, µg/m³ (legal limit 40) | 28.7 | 27.8 |
| Highest daily average, µg/m³ | 70December 31 | 55December 25 |
| Highest hourly value, µg/m³ | 150January 17 | 118December 20 |
| Hours measured | 93 % | 96 % |
| Days without any reading from the station | 10 | 8 |
■ 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.
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 17 % of hours · verified
Days in 2025: O₃, 8-hour average above 120 µg/m³
15 days above the limit. 34 days without any reading from the station.
- above the limit
- below the limit
- too few readings for the day
- no O₃ data in the EEA database
- no data from the station
Days above the limit with values (15)
- Mar 20 141
- Jun 7 126
- Jun 10 127
- Jun 11 131
- Jun 12 124
- Jun 13 126
- Jun 14 134
- Jun 16 125
- Jun 22 123
- Jun 23 124
- Jun 25 145
- Jun 26 139
- Jul 1 130
- Jul 2 129
- Jul 14 127
Values in µg/m³, limit 120 µg/m³.
Months of 2025
| Month | Days above 120 | Highest 8 h | No readings |
|---|---|---|---|
| January | 0 | 46 | 3 |
| February | 0 | 70 | 0 |
| March | 1 above the number allowed | 141 | 0 |
| April | 0 | 92 | 1 |
| May | 0 | 105 | 0 |
| June | 11 above the number allowed | 145 | 0 |
| July | 3 above the number allowed | 130 | 12 |
| August | 0 | 114 | 15 |
| September | 0 | 116 | 0 |
| October | 0 | 71 | 0 |
| November | 0 | 48 | 3 |
| December | 0 | 31 | 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 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 | no measurement | |
| Mon, 9/28 | no measurement | |
| Sun, 9/27 | no measurement | |
| Sat, 9/26 | no measurement | |
| Fri, 9/25 | no measurement | |
| Thu, 9/24 | no measurement | |
| Wed, 9/23 | no measurement | |
| Tue, 9/22 | no measurement | |
| 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 | 34.6 | year before: same days |
| September 2026 | too few readings | 39.2 | 20 days without data from the station |
| August 2026 | too few readings | too few readings | 10 days without data from the station |
| July 2026 | too few readings | too few readings | 13 days without data from the station |
| June 2026 | too few readings | 75.3 | 10 days without data from the station |
| May 2026 | too few readings | 47.9 | 3 days without data from the station |
| April 2026 | too few readings | 42 | 16 days without data from the station |
| March 2026 | too few readings | 36 | 3 days without data from the station |
| February 2026 | too few readings | 19.8 | |
| January 2026 | too few readings | 14.3 | 6 days without data from the station |
| December 2025 | too few readings | 14.6 | measured in 61 % of hours · verified |
| November 2025 | too few readings | too few readings | measured in 67 % of hours · verified · 3 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 | 2025 | 2024 | 2023 |
|---|---|---|---|
| Days with 8-hour average above 120 µg/m³ (target value 25) | ≥ 15² | 15 | ≥ 20² |
| Annual average, µg/m³ | 37.7¹ | 30.6 | too few |
| Highest 8-hour average, µg/m³ | 145June 25 | 150August 14 | 296June 24 |
| Hours measured | 82 % | 95 % | 68 % |
| Days without any reading from the station | 34 | 10 | 8 |
≥ 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 2025
| Day | Highest 8 h | Times the limit |
|---|---|---|
| Jun 25, 2025 | 145 | 1.2 × |
| Mar 20, 2025 | 141 | 1.2 × |
| Jun 26, 2025 | 139 | 1.2 × |
| Jun 14, 2025 | 134 | 1.1 × |
| Jun 11, 2025 | 131 | 1.1 × |
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
30.1
Nowµg/m³
Measured at 19:00
40.8
Last 24 hoursµg/m³
measured in 88 % of hours · provisional
20.6
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 73 % of hours · provisional
Days in 2025: SO₂, daily average above 125 µg/m³
No measured day above the limit. 34 days without any reading from the station.
- above the limit
- below the limit
- too few readings for the day
- no data from the station
Months of 2025
| Month | Days above 125 | Hours above 350 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 117 | 3 |
| February | 0 | 3 | 118 | 0 |
| March | 0 | 1 | 79 | 0 |
| April | 0 | 0 | 34 | 1 |
| May | 0 | 2 | 59 | 0 |
| June | 0 | 1 | 50 | 0 |
| July | 0 | 0 | 39 | 12 |
| August | 0 | 1 | 79 | 15 |
| September | 0 | 1 | 78 | 0 |
| October | 0 | 0 | 54 | 0 |
| November | 0 | 2 | 80 | 3 |
| December | 0 | 1 | 103 | 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 | 30.1 | |
| 18:00 | 28.2 | |
| 17:00 | 35 | |
| 16:00 | 86.9 | |
| 15:00 | 62 | |
| 14:00 | 25.2 | |
| 13:00 | 109.7 | |
| 12:00 | 45.3 | |
| 11:00 | 69.2 | |
| 10:00 | 98.9 | |
| 09:00 | 67.5 | |
| 08:00 | 24.6 | |
| 07:00 | 17.4 | |
| 06:00 | 16.1 | |
| 05:00 | 17.6 | |
| 04:00 | 16.9 | |
| 03:00 | 18.2 | |
| 02:00 | 20 | |
| 01:00 | 20.9 | |
| Tuesday, 10/6 | ||
| 00:00 | 22.3 | |
| 23:00 | 24.5 | |
| 22:00 | 24.4 | |
| 21:00 | 21.7 | |
| 20:00 | 21.1 | |
| 19:00 | 18.1 | |
| 18:00 | 19.6 | |
| 17:00 | 17.8 | |
| 16:00 | 14.6 | |
| 15:00 | 11.9 | |
| 14:00 | 16.1 | |
| 13:00 | 23.8 | |
| 12:00 | 32 | |
| 11:00 | 43.5 | |
| 10:00 | 52.5 | |
| 09:00 | 40 | |
| 08:00 | 18.2 | |
| 07:00 | 15.7 | |
| 06:00 | 15.1 | |
| 05:00 | 16.5 | |
| 04:00 | 17.6 | |
| 03:00 | 18.6 | |
| 02:00 | 20.8 | |
| 01:00 | 23.3 | |
| Monday, 10/5 | ||
| 00:00 | 26.6 | |
| 23:00 | 28.6 | |
| 22:00 | 30.7 | |
| 21:00 | 27.8 | |
| 20:00 | 24.1 | |
| 19:00 | 21 | |
| 18:00 | 23.2 | |
| 17:00 | 27.1 | |
| 16:00 | 32.3 | |
| 15:00 | 38.2 | |
| 14:00 | 53.1 | |
| 13:00 | 68 | |
| 12:00 | 131.9 | |
| 11:00 | 107.3 | |
| 10:00 | 90.5 | |
| 09:00 | 40.9 | |
| 08:00 | 16.6 | |
| 07:00 | 14.1 | |
| 06:00 | 13.6 | |
| 05:00 | 12.1 | |
| 04:00 | 13.9 | |
| 03:00 | 14.5 | |
| 02:00 | 14.4 | |
| 01:00 | 15.6 | |
| Sunday, 10/4 | ||
| 00:00 | 16.7 | |
| 23:00 | 18.5 | |
| 22:00 | 19.4 | |
| 21:00 | 16.7 | |
| 20:00 | 16.6 | |
| 19:00 | 14.5 | |
| 18:00 | 12.7 | |
| 17:00 | 23.2 | |
| 16:00 | 15.7 | |
| 15:00 | 13.1 | |
| 14:00 | 14.4 | |
| 13:00 | 19.3 | |
| 12:00 | 23.7 | |
| 11:00 | 53.6 | |
| 10:00 | 37.7 | |
| 09:00 | 24 | |
| 08:00 | 13 | |
| 07:00 | 12.8 | |
| 06:00 | 12.2 | |
| 05:00 | 12.9 | |
| 04:00 | 12.8 | |
| 03:00 | 13.5 | |
| 02:00 | 13.8 | |
| 01:00 | 14.6 | |
| Saturday, 10/3 | ||
| 00:00 | 16.3 | |
| 23:00 | 17.7 | |
| 22:00 | 18.9 | |
| 21:00 | 19.4 | |
| 20:00 | 17.3 | |
| 19:00 | 14.6 | |
| 18:00 | 11.9 | |
| 17:00 | 12.8 | |
| 16:00 | 13.7 | |
| 15:00 | 14.6 | |
| 14:00 | 13.8 | |
| 13:00 | 12 | |
| 12:00 | 15.8 | |
| 11:00 | 21.4 | |
| 10:00 | 41.9 | |
| 09:00 | 18.9 | |
| 08:00 | 13.1 | |
| 07:00 | 12.4 | |
| 06:00 | 12.2 | |
| 05:00 | 12.9 | |
| 04:00 | 13.1 | |
| 03:00 | 13.7 | |
| 02:00 | 15.1 | |
| 01:00 | 16.3 | |
| Friday, 10/2 | ||
| 00:00 | 18.5 | |
| 23:00 | 20.3 | |
| 22:00 | 22.3 | |
| 21:00 | 23.2 | |
| 20:00 | 24.8 | |
| 19:00 | 16.7 | |
| 18:00 | 14.3 | |
| 17:00 | 11.5 | |
| 16:00 | 11.3 | |
| 15:00 | 12.7 | |
| 14:00 | 10.9 | |
| 13:00 | 11.9 | |
| 12:00 | 14.9 | |
| 11:00 | 17.4 | |
| 10:00 | 33.4 | |
| 09:00 | 31.6 | |
| 08:00 | 13.4 | |
| 07:00 | 11.7 | |
| 06:00 | 12 | |
| 05:00 | 12.6 | |
| 04:00 | 12.1 | |
| 03:00 | 13.9 | |
| 02:00 | 14.9 | |
| 01:00 | 15.6 | |
| Thursday, 10/1 | ||
| 00:00 | 16.9 | |
| 23:00 | 18.4 | |
| 22:00 | 18.9 | |
| 21:00 | 17.7 | |
| 20:00 | 12.2 | |
| 19:00 | 11.7 | |
| 18:00 | 11.3 | |
| 17:00 | 11.7 | |
| 16:00 | 9.9 | |
| 15:00 | 13.2 | |
| 14:00 | 12.7 | |
| 13:00 | 14.9 | |
| 12:00 | 14.3 | |
| 11:00 | 19.7 | |
| 10:00 | 61.4 | |
| 09:00 | 22.1 | |
| 08:00 | 15 | |
| 07:00 | 13.2 | |
| 06:00 | 13.8 | |
| 05:00 | 13.3 | |
| 04:00 | 13.8 | |
| 03:00 | 13.6 | |
| 02:00 | 14 | |
| 01:00 | 14.5 | |
| Wednesday, 9/30 | ||
| 00:00 | 15.6 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 22.9 | provisional |
| Mon, 10/5 | 36.9 | provisional |
| Sun, 10/4 | 18.6 | provisional |
| Sat, 10/3 | 16.2 | provisional |
| Fri, 10/2 | 16.7 | provisional |
| Thu, 10/1 | 16.6 | provisional |
| Wed, 9/30 | 16.4 | provisional |
| Tue, 9/29 | 39 | provisional |
| Mon, 9/28 | 21.8 | provisional |
| Sun, 9/27 | 17.6 | provisional |
| Sat, 9/26 | 19.1 | provisional |
| Fri, 9/25 | 14 | provisional |
| Thu, 9/24 | 30 | provisional |
| Wed, 9/23 | 12.6 | 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 | 21.3 | 18.8 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | too few readings | 25.5 | measured in 30 % of hours · provisional · 20 days without data from the station |
| August 2026 | too few readings | too few readings | measured in 66 % of hours · provisional · 10 days without data from the station |
| July 2026 | too few readings | too few readings | measured in 53 % of hours · provisional · 13 days without data from the station |
| June 2026 | too few readings | 20.5 | measured in 61 % of hours · provisional · 10 days without data from the station |
| May 2026 | 15.3 | 17 | measured in 87 % of hours · provisional · 3 days without data from the station |
| April 2026 | too few readings | 17 | measured in 40 % of hours · provisional · 16 days without data from the station |
| March 2026 | 30.6 | 28.2 | measured in 88 % of hours · provisional · 3 days without data from the station |
| February 2026 | 28.2 | 46.7 | measured in 100 % of hours · provisional |
| January 2026 | too few readings | 59.4 | measured in 73 % of hours · provisional · 6 days without data from the station |
| December 2025 | 39.6 | 49.2 | measured in 94 % of hours · verified |
| November 2025 | 29.2 | too few readings | measured in 85 % of hours · verified · 3 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* | 2025 | 2024 |
|---|---|---|---|
| Days above 125 µg/m³ (allowed 3) | ≥ 2² | 0² | ≥ 27 above the number allowed |
| Hours above 350 µg/m³ (allowed 24) | ≥ 13² | ≥ 12² | 70 above the number allowed |
| Hours above 500 µg/m³, three hours in a row (alert threshold) | ≥ 8 above the number allowed | 0 | 10 above the number allowed |
| Annual average, µg/m³ (legal limit 50) | too few | 29¹ | 45 |
| Highest daily average, µg/m³ | 356January 21 | 118February 1 | 377January 11 |
| Highest hourly value, µg/m³ | 902January 21 | 727February 1 | 1,305February 15 |
| Hours measured | 67 % | 88 % | 91 % |
| Days without any reading from the station | 81 | 34 | 10 |
* 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.
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 2025 there were 45 such days.
- WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2025 there were 72 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.
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: 96
12 outages, 2,313 hours in total in the last 12 months.
Timeline of outages from October 7, 2025 to today
| From | To | Duration |
|---|---|---|
| Sep 1, 2026 08:00 | Sep 22, 2026 09:00 | 21 days |
| Jul 19, 2026 22:00 | Aug 11, 2026 14:00 | 23 days |
| Jul 1, 2026 09:00 | Jul 3, 2026 14:00 | 2 days |
| May 29, 2026 09:00 | Jun 11, 2026 11:00 | 13 days |
| May 22, 2026 23:00 | May 24, 2026 08:00 | 33 hours |
| Apr 15, 2026 11:00 | Apr 20, 2026 20:00 | 5 days |
| Mar 28, 2026 05:00 | Apr 13, 2026 16:00 | 16 days |
| Jan 26, 2026 14:00 | Jan 28, 2026 14:00 | 2 days |
| Jan 9, 2026 13:00 | Jan 11, 2026 11:00 | 46 hours |
| Dec 31, 2025 11:00 | Jan 5, 2026 14:00 | 5 days |
| Dec 28, 2025 06:00 | Dec 29, 2025 11:00 | 29 hours |
| Nov 18, 2025 02:00 | Nov 22, 2025 01:00 | 4 days |
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).
- Municipality
- May run its own stations with the consent of the canton and must publish their results (Art. 16 and 17).
- 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).
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 Tuzla
samoEKO is a brand of samoLabs, Juelich.