Air at the Gacko station
Gacko, Republika Srpska
Network: Republic Hydrometeorological Institute of Republic of Srpska · Station code: BA0053A
This year, up to yesterday (October 6)
3 days
with a daily average of particulate matter PM10 above the legal limit of 50 µg/m³.
35 days are allowed in the whole year.
at least
2 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 14, 2026, PM10 91 µg/m³ as a daily average, 1.8 times the limit.
Daily average for 262 of 279 days · data for 2026 not yet finally verified · Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)
No data has arrived from this station since October 6, 2026 at 15:00
No reading for 27 hours.
We take the readings from the European Environment Agency (EEA), and no new values for this station are coming from there. The cause may lie with the station itself or with the data transmission.
This station is one of 6 stations in Republika Srpska from which no data has been arriving since October 6, 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: October 6, 2026 at 15:00
Measured then: NO₂ 12.5 µg/m³
Nearest station measuring now: Niksic2, Nik_i_, Montenegro, about 54 km away.
That reading is from another place. Your air may be better or worse.
How the air is changing
Over the last seven days there was more NO₂ in the air than the week before.
- PM10: too few readings to compare
- NO₂: average 20 µg/m³, week before 17.3 µg/m³
- SO₂: too few readings to compare
Last month there was less PM10 in the air than the month before.
- PM10: average 13.5 µg/m³, month before 17 µg/m³
- NO₂: average 15.4 µg/m³, month before 15.2 µg/m³
- 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 60 % of hours · provisional
too few readings
Last 12 months
measured in 72 % of hours · provisional
Days in 2026: PM10, daily average above 50 µg/m³
3 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 (3)
- Jan 13 60
- Jan 14 91
- Jan 15 61
Values in µg/m³, limit 50 µg/m³.
Months of 2026
| Month | Days above 50 | Highest day | No readings |
|---|---|---|---|
| January | 3 above the number allowed | 91 | 0 |
| February | 0 | 21 | 0 |
| March | 0 | 34 | 0 |
| April | 0 | 23 | 0 |
| May | 0 | 15 | 0 |
| June | 0 | 35 | 0 |
| July | 0 | 11 | 0 |
| August | 0 | 42 | 0 |
| September | 0 | 28 | 0 |
| October up to yesterday | 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 | too few readings | |
| Thu, 9/24 | 21.3 | provisional |
| Wed, 9/23 | 4.6 | provisional |
| Tue, 9/22 | 7.3 | provisional |
| Mon, 9/21 | 6.8 | provisional |
| Sun, 9/20 | 9.1 | provisional |
| Sat, 9/19 | 7.7 | provisional |
| Fri, 9/18 | 9.9 | provisional |
| Thu, 9/17 | 6.6 | provisional |
| Wed, 9/16 | 12.8 | provisional |
| Tue, 9/15 | 9.3 | provisional |
| Mon, 9/14 | 11.8 | provisional |
| Sun, 9/13 | 10 | provisional |
| Sat, 9/12 | 8.3 | provisional |
| Fri, 9/11 | 11.3 | provisional |
| Thu, 9/10 | 22.1 | provisional |
| Wed, 9/9 | 25 | provisional |
| Tue, 9/8 | 26.9 | provisional |
| Mon, 9/7 | 10.5 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | too few readings | ||
| September 2026 | 13.5 | measured in 80 % of hours · provisional | |
| August 2026 | 17 | measured in 100 % of hours · provisional | |
| July 2026 | 5.2 | measured in 100 % of hours · provisional | |
| June 2026 | 10.6 | measured in 100 % of hours · provisional | |
| May 2026 | 7.9 | measured in 96 % of hours · provisional | |
| April 2026 | 13.8 | measured in 94 % of hours · provisional | |
| March 2026 | 18.5 | measured in 100 % of hours · provisional | |
| February 2026 | 11.5 | measured in 100 % of hours · provisional | |
| January 2026 | 21.6 | measured in 100 % of hours · provisional | |
| December 2025 | too few readings | ||
| November 2025 | too few readings |
PM10 by year
Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)
| Measure | 2026* |
|---|---|
| Days above 50 µg/m³ (allowed 35) | 3 |
| Annual average, µg/m³ (legal limit 40) | 13.3* |
| Highest daily average, µg/m³ | 91January 14 |
| Highest hourly value, µg/m³ | 91January 13 |
| Hours measured | 95 % |
| Days without any reading from the station | 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.
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.
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 2026 there were 3 such days.
- WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2026 there were 3 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 2026
| Day | Average | Times the limit |
|---|---|---|
| Jan 14, 2026provisional | 91 | 1.8 × |
| Jan 15, 2026provisional | 61 | 1.2 × |
| Jan 13, 2026provisional | 60 | 1.2 × |
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
20
Last 7 daysµg/m³
measured in 95 % of hours · provisional
17.3
Last 30 daysµg/m³
measured in 97 % of hours · provisional
too few readings
Last 12 months
measured in 67 % of hours · provisional
Days in 2026: 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
Months of 2026
| Month | Days above 85 | Hours above 150 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 51 | 0 |
| February | 0 | 0 | 30 | 0 |
| March | 0 | 0 | 31 | 0 |
| April | 0 | 0 | 27 | 0 |
| May | 0 | 0 | 21 | 0 |
| June | 0 | 0 | 20 | 0 |
| July | 0 | 0 | 30 | 0 |
| August | 0 | 0 | 24 | 0 |
| September | 0 | 0 | 28 | 0 |
| October up to yesterday | 0 | 0 | 30 | 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 | 15 | model estimate, not counted |
| 17:00 | 14 | model estimate, not counted |
| 16:00 | 14 | model estimate, not counted |
| 15:00 | 13 | model estimate, not counted |
| 14:00 | 14 | model estimate, not counted |
| 13:00 | 14 | model estimate, not counted |
| 12:00 | 13 | model estimate, not counted |
| 11:00 | 14 | model estimate, not counted |
| 10:00 | 15 | model estimate, not counted |
| 09:00 | 16 | model estimate, not counted |
| 08:00 | 16 | model estimate, not counted |
| 07:00 | 15 | model estimate, not counted |
| 06:00 | 14 | model estimate, not counted |
| 05:00 | 13 | model estimate, not counted |
| 04:00 | 9 | model estimate, not counted |
| 03:00 | 10 | model estimate, not counted |
| 02:00 | 13 | model estimate, not counted |
| 01:00 | 13 | model estimate, not counted |
| Tuesday, 10/6 | ||
| 00:00 | 13 | model estimate, not counted |
| 23:00 | 13 | model estimate, not counted |
| 22:00 | 13 | model estimate, not counted |
| 21:00 | 13 | model estimate, not counted |
| 20:00 | 13 | model estimate, not counted |
| 19:00 | 13 | model estimate, not counted |
| 18:00 | 13 | model estimate, not counted |
| 17:00 | 13 | model estimate, not counted |
| 16:00 | 13 | model estimate, not counted |
| 15:00 | 12.5 | |
| 14:00 | 18.9 | |
| 13:00 | 27.4 | |
| 12:00 | 24.7 | |
| 11:00 | 36.3 | |
| 10:00 | 50 | |
| 09:00 | 28.5 | |
| 08:00 | 26 | |
| 07:00 | 25.9 | |
| 06:00 | 28.6 | |
| 05:00 | 31.7 | |
| 04:00 | 32.4 | |
| 03:00 | 32.4 | |
| 02:00 | 27 | |
| 01:00 | 31.2 | |
| Monday, 10/5 | ||
| 00:00 | 40.7 | |
| 23:00 | 39.3 | |
| 22:00 | 36.7 | |
| 21:00 | 33.6 | |
| 20:00 | 29.9 | |
| 19:00 | 25.5 | |
| 18:00 | 17 | |
| 17:00 | 17.4 | |
| 16:00 | 17.6 | |
| 15:00 | 23.1 | |
| 14:00 | 30.3 | |
| 13:00 | 39.1 | |
| 12:00 | 25.1 | |
| 11:00 | 32.6 | |
| 10:00 | 35.5 | |
| 09:00 | 27.7 | |
| 08:00 | 26 | |
| 07:00 | 26.5 | |
| 06:00 | 27.9 | |
| 05:00 | 29.9 | |
| 04:00 | 31.1 | |
| 03:00 | 30.8 | |
| 02:00 | 29.3 | |
| 01:00 | 33.1 | |
| Sunday, 10/4 | ||
| 00:00 | 37.7 | |
| 23:00 | 43.2 | |
| 22:00 | 36.5 | |
| 21:00 | 27.5 | |
| 20:00 | 15.2 | |
| 19:00 | 15.8 | |
| 18:00 | 15.4 | |
| 17:00 | 27 | |
| 16:00 | 47.1 | |
| 15:00 | 43.5 | |
| 14:00 | 41.4 | |
| 13:00 | 34.6 | |
| 12:00 | 32.2 | |
| 11:00 | 32.6 | |
| 10:00 | 32 | |
| 09:00 | 27.7 | |
| 08:00 | 27.9 | |
| 07:00 | 28 | |
| 06:00 | 28.1 | |
| 05:00 | 28.5 | |
| 04:00 | 32.1 | |
| 03:00 | 26.2 | |
| 02:00 | 24.6 | |
| 01:00 | 27.3 | |
| Saturday, 10/3 | ||
| 00:00 | 26.2 | |
| 23:00 | 12.9 | |
| 22:00 | 9 | |
| 21:00 | 9.9 | |
| 20:00 | 12.3 | |
| 19:00 | 11.2 | |
| 18:00 | 8.4 | |
| 17:00 | 10 | |
| 16:00 | 13.7 | |
| 15:00 | 15.8 | |
| 14:00 | 15.1 | |
| 13:00 | 12.8 | |
| 12:00 | 10.9 | |
| 11:00 | 7.8 | |
| 10:00 | 6.9 | |
| 09:00 | 6 | |
| 08:00 | 6.6 | |
| 07:00 | 5.7 | |
| 06:00 | 5.8 | |
| 05:00 | 6.3 | |
| 04:00 | 5.4 | |
| 03:00 | 8.5 | |
| 02:00 | 5.3 | |
| 01:00 | 9 | |
| Friday, 10/2 | ||
| 00:00 | 13.2 | |
| 23:00 | 20.3 | |
| 22:00 | 14.1 | |
| 21:00 | 13.1 | |
| 20:00 | 9.5 | |
| 19:00 | 8 | |
| 18:00 | 7.2 | |
| 17:00 | 8.1 | |
| 16:00 | 11.4 | |
| 15:00 | 12.4 | |
| 14:00 | 15.3 | |
| 13:00 | 17.1 | |
| 12:00 | 16.6 | |
| 11:00 | 17.4 | |
| 10:00 | 19.9 | |
| 09:00 | 28.7 | |
| 08:00 | 26.5 | |
| 07:00 | 27 | |
| 06:00 | 9.8 | |
| 05:00 | 6.1 | |
| 04:00 | 12.4 | |
| 03:00 | 8.4 | |
| 02:00 | 8.2 | |
| 01:00 | 6.1 | |
| Thursday, 10/1 | ||
| 00:00 | 7.3 | |
| 23:00 | 7.2 | |
| 22:00 | 9.6 | |
| 21:00 | 15.8 | |
| 20:00 | 13.7 | |
| 19:00 | 11.7 | |
| 18:00 | 11.5 | |
| 17:00 | 11 | |
| 16:00 | 14.9 | |
| 15:00 | 20 | |
| 14:00 | 22.2 | |
| 13:00 | 18.7 | |
| 12:00 | 18.2 | |
| 11:00 | 21.7 | |
| 10:00 | 24 | |
| 09:00 | 24.1 | |
| 08:00 | 24.6 | |
| 07:00 | 20.8 | |
| 06:00 | 10.9 | |
| 05:00 | 6.3 | |
| 04:00 | 7.3 | |
| 03:00 | 6.6 | |
| 02:00 | 6.7 | |
| 01:00 | 8.8 | |
| Wednesday, 9/30 | ||
| 00:00 | 12.8 | |
| 23:00 | 14.3 | |
| 22:00 | 14.5 | |
| 21:00 | 17 | |
| 20:00 | 14.9 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | too few readings | |
| Mon, 10/5 | 29.4 | provisional |
| Sun, 10/4 | 30.5 | provisional |
| Sat, 10/3 | 10.1 | provisional |
| Fri, 10/2 | 14 | provisional |
| Thu, 10/1 | 14.3 | provisional |
| Wed, 9/30 | 16.3 | provisional |
| Tue, 9/29 | 23.6 | provisional |
| Mon, 9/28 | 27.9 | provisional |
| Sun, 9/27 | 19.8 | provisional |
| Sat, 9/26 | 14.5 | provisional |
| Fri, 9/25 | 9 | provisional |
| Thu, 9/24 | 15.3 | provisional |
| Wed, 9/23 | too few readings | |
| Tue, 9/22 | 4.6 | provisional |
| Mon, 9/21 | 12 | provisional |
| Sun, 9/20 | 19.1 | provisional |
| Sat, 9/19 | 17.2 | provisional |
| Fri, 9/18 | 18.5 | provisional |
| Thu, 9/17 | 18.2 | provisional |
| Wed, 9/16 | 17.6 | provisional |
| Tue, 9/15 | 11.3 | provisional |
| Mon, 9/14 | 18.8 | provisional |
| Sun, 9/13 | 17 | provisional |
| Sat, 9/12 | 13.5 | provisional |
| Fri, 9/11 | 17.1 | provisional |
| Thu, 9/10 | 18.2 | provisional |
| Wed, 9/9 | 22.3 | provisional |
| Tue, 9/8 | 23.8 | provisional |
| Mon, 9/7 | 8.9 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 20.7 | measured in 94 % of hours · provisional | |
| September 2026 | 15.4 | measured in 98 % of hours · provisional | |
| August 2026 | 15.2 | measured in 100 % of hours · provisional | |
| July 2026 | 19.1 | measured in 100 % of hours · provisional | |
| June 2026 | 10.4 | measured in 88 % of hours · provisional | |
| May 2026 | too few readings | measured in 57 % of hours · provisional | |
| April 2026 | 12 | measured in 84 % of hours · provisional | |
| March 2026 | 18 | measured in 90 % of hours · provisional | |
| February 2026 | 15.1 | measured in 82 % of hours · provisional | |
| January 2026 | 24.3 | measured in 83 % of hours · provisional | |
| December 2025 | too few readings | ||
| November 2025 | too few readings |
NO₂ by year
Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)
| Measure | 2026* |
|---|---|
| Days above 85 µg/m³ (none allowed) | 0² |
| Hours above 150 µg/m³ (allowed 18) | 0² |
| Hours above 400 µg/m³, three hours in a row (concentration dangerous to health) | 0 |
| Annual average, µg/m³ (legal limit 40) | 15.8* |
| Highest daily average, µg/m³ | 51January 13 |
| Highest hourly value, µg/m³ | 91January 15 |
| Hours measured | 87 % |
| Days without any reading from the station | 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.
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 concentration dangerous to health: every such hour 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 2026 there was 1 such day.
- WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2026 there were 31 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.
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 2026: SO₂, daily average above 125 µg/m³
No measured day above the limit.
- above the limit
- below the limit
- no SO₂ data in the EEA database
Months of 2026
| Month | Days above 125 | Hours above 350 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 40 | 0 |
| February | 0 | 2 | 66 | 0 |
| March | 0 | 0 | 50 | 0 |
| April | 0 | |||
| May | 0 | |||
| June | 0 | |||
| July | 0 | |||
| August | 0 | |||
| September | 0 | |||
| October up to yesterday | 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.
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 measurement | |
| Sun, 9/20 | no measurement | |
| Sat, 9/19 | no measurement | |
| Fri, 9/18 | no measurement | |
| Thu, 9/17 | no measurement | |
| Wed, 9/16 | no measurement | |
| Tue, 9/15 | no measurement | |
| Mon, 9/14 | no measurement | |
| Sun, 9/13 | no measurement | |
| Sat, 9/12 | no measurement | |
| Fri, 9/11 | no measurement | |
| Thu, 9/10 | no measurement | |
| Wed, 9/9 | no measurement | |
| Tue, 9/8 | no measurement | |
| Mon, 9/7 | no measurement |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | too few readings | ||
| September 2026 | too few readings | ||
| August 2026 | too few readings | ||
| July 2026 | too few readings | ||
| June 2026 | too few readings | ||
| May 2026 | too few readings | ||
| April 2026 | too few readings | ||
| March 2026 | too few readings | measured in 35 % of hours · provisional | |
| February 2026 | 30.8 | measured in 100 % of hours · provisional | |
| January 2026 | 20.2 | measured in 100 % of hours · provisional | |
| December 2025 | too few readings | ||
| November 2025 | too few readings |
SO₂ by year
Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)
| Measure | 2026* |
|---|---|
| Days above 125 µg/m³ (allowed 3) | 0² |
| Hours above 350 µg/m³ (allowed 24) | ≥ 2² |
| Hours above 500 µg/m³, three hours in a row (concentration dangerous to health) | 0 |
| Annual average, µg/m³ (legal limit 50) | too few |
| Highest daily average, µg/m³ | 66February 28 |
| Highest hourly value, µg/m³ | 378February 28 |
| Hours measured | 25 % |
| Days without any reading from the station | 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 concentration dangerous to health: every such hour 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 2026 there were 4 such days.
- WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2026 there were 8 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: 1
1 outage, 27 hours in total in the last 12 months.
Timeline of outages from October 7, 2025 to today
| From | To | Duration |
|---|---|---|
| Oct 6, 2026 15:00 | still ongoing | 27 hours |
Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.
Who is responsible
In Republika Srpska air quality is governed by the Air Protection Act (Official Gazette RS 124/11 and 46/17) and the Regulation on Air Quality Values (Official Gazette RS 124/12). The republic’s monitoring network is run by the Republic Hydrometeorological Institute (RHMZ RS), which publishes an air quality report every year.
We take the limit values from the RHMZ RS report for 2025, which cites the regulation. Unlike in the Federation of BiH, the hourly limit for nitrogen dioxide is 150 µg/m³, at most 18 times a year. As in the Federation, nitrogen dioxide also has a daily limit of 85 µg/m³ with no exceedance allowed. The regulation calls 500 µg/m³ of sulphur dioxide and 400 µg/m³ of nitrogen dioxide over three hours in a row a concentration dangerous to health.
We have not yet checked in the text of the law who in Republika Srpska must adopt a plan when a limit is exceeded, so we do not state it here.
We show measured values only. Whether an episode has been declared is decided by the competent authorities, who publish it on their own pages.
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 Republic Hydrometeorological Institute of Republic of Srpska. 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 those of Republika Srpska (Uredba o vrijednostima kvaliteta vazduha, Official Gazette RS 124/12), as listed by RHMZ RS in its report for 2025. Unlike in the FBiH, the hourly limit for NO₂ is 150 µg/m³. 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.