Air at the Belgrade-Mostar station
Savski venac, Serbia
Network: Agency for Environmental Protection · Station code: RS0028A
This year, up to yesterday (October 6)
at least
24 days
with a daily average of particulate matter PM10 above the EU limit of 50 µg/m³.
Readings are missing for part of the period, so the real number may be higher.
In 2025: 64 days above the limit, 35 allowed.
Worst day: March 2, 2026, PM10 123 µg/m³ as a daily average, 2.5 times the limit.
Daily average for 229 of 279 days · data for 2026 not yet finally verified · Yardstick: EU limits (Directive 2008/50/EC)
Extremely poor
Air now · Measured at 21:00
Latest values
Latest value: 21:00
| Pollutant | Value | Level |
|---|---|---|
| PM10 | 102.2 µg/m³ | Moderate |
| NO₂ | 157.8 µg/m³ | Extremely poor |
| SO₂ | 46 µg/m³ | Moderate |
How the air is changing
Over the last seven days there was more PM10, NO₂, and SO₂ in the air than the week before.
- PM10: average 48.6 µg/m³, week before 34.9 µg/m³
- PM2.5: average 19.8 µg/m³, week before 18.9 µg/m³
- NO₂: average 68.2 µg/m³, week before 46.8 µg/m³
- SO₂: average 10.4 µg/m³, week before 8.6 µg/m³
Last month there was more PM10 and PM2.5 in the air than the month before.
- PM10: average 37.1 µg/m³, month before 33.5 µg/m³
- PM2.5: average 14.1 µg/m³, month before 11.6 µg/m³
- NO₂: average 44.4 µg/m³, month before 42.8 µg/m³
- SO₂: average 8.4 µg/m³, month before 9.1 µg/m³
Show
Particulate matter PM10
102.2
Nowµg/m³
Measured at 21:00
85
Last 24 hoursµg/m³
measured in 96 % of hours · provisional
48.6
Last 7 daysµg/m³
measured in 100 % of hours · provisional
39.9
Last 30 daysµg/m³
measured in 100 % of hours · provisional
too few readings
Last 12 months
measured in 86 % of hours · 2 months with too few readings · provisional
Days in 2023: PM10, daily average above 50 µg/m³
29 days above the limit.
- above the limit
- below the limit
- too few readings for the day
Days above the limit with values (29)
- Jan 1 104
- Jan 2 90
- Jan 3 53
- Jan 7 70
- Jan 8 58
- Feb 11 78
- Feb 12 53
- Feb 13 64
- Feb 15 60
- Feb 16 77
- Feb 17 67
- Feb 22 53
- Mar 4 51
- Dec 9 55
- Dec 10 53
- Dec 11 62
- Dec 12 50
- Dec 17 70
- Dec 18 111
- Dec 19 116
- Dec 20 87
- Dec 24 61
- Dec 25 103
- Dec 26 124
- Dec 27 84
- Dec 28 91
- Dec 29 89
- Dec 30 86
- Dec 31 62
Values in µg/m³, limit 50 µg/m³.
Months of 2023
| Month | Days above 50 | Highest day | No readings |
|---|---|---|---|
| January | 5 above the number allowed | 104 | 0 |
| February | 7 above the number allowed | 78 | 0 |
| March | 1 above the number allowed | 51 | 0 |
| April | 0 | 46 | 0 |
| May | 0 | 25 | 0 |
| June | 0 | 16 | 0 |
| July | 0 | 28 | 0 |
| August | 0 | 32 | 0 |
| September | 0 | 26 | 0 |
| October | 0 | 36 | 0 |
| November | 0 | 49 | 0 |
| December | 16 above the number allowed | 124 | 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 | ||
| 22:00 | 56 | model estimate, not counted |
| 21:00 | 102.2 | |
| 20:00 | 85 | |
| 19:00 | 73.2 | |
| 18:00 | 78.7 | |
| 17:00 | 70.6 | |
| 16:00 | 53.8 | |
| 15:00 | 56.2 | |
| 14:00 | 97.7 | |
| 13:00 | 145.9 | |
| 12:00 | 166.2 | |
| 11:00 | 134.7 | |
| 10:00 | 108.6 | |
| 09:00 | 124 | |
| 08:00 | 74.1 | |
| 07:00 | 52.8 | |
| 06:00 | 44 | |
| 05:00 | 41.9 | |
| 04:00 | 51.2 | |
| 03:00 | 57.3 | |
| 02:00 | 72.3 | |
| 01:00 | 72.9 | |
| Tuesday, 10/6 | ||
| 00:00 | 87.6 | |
| 23:00 | 104.6 | |
| 22:00 | 107 | |
| 21:00 | 105.9 | |
| 20:00 | 81.5 | |
| 19:00 | 55.6 | |
| 18:00 | 45.3 | |
| 17:00 | 46.7 | |
| 16:00 | 48.7 | |
| 15:00 | 57.2 | |
| 14:00 | 74.9 | |
| 13:00 | 108.6 | |
| 12:00 | 107 | |
| 11:00 | 122 | |
| 10:00 | 154.5 | |
| 09:00 | 103 | |
| 08:00 | 71 | |
| 07:00 | 55 | |
| 06:00 | 51.4 | |
| 05:00 | 44.1 | |
| 04:00 | 59.6 | |
| 03:00 | 63.2 | |
| 02:00 | 75.3 | |
| 01:00 | 79.7 | |
| Monday, 10/5 | ||
| 00:00 | 93.3 | |
| 23:00 | 108.4 | |
| 22:00 | 105.3 | |
| 21:00 | 100.5 | |
| 20:00 | 85.3 | |
| 19:00 | 56.7 | |
| 18:00 | 43.9 | |
| 17:00 | 47 | |
| 16:00 | 36.4 | |
| 15:00 | 51 | |
| 14:00 | 110.3 | |
| 13:00 | 143.5 | |
| 12:00 | 94.5 | |
| 11:00 | 92.9 | |
| 10:00 | 77.1 | |
| 09:00 | 76.8 | |
| 08:00 | 54.8 | |
| 07:00 | 43.7 | |
| 06:00 | 38.3 | |
| 05:00 | 37.1 | |
| 04:00 | 56.1 | |
| 03:00 | 62.6 | |
| 02:00 | 67.3 | |
| 01:00 | 74.1 | |
| Sunday, 10/4 | ||
| 00:00 | 76.9 | |
| 23:00 | 74 | |
| 22:00 | 61.4 | |
| 21:00 | 55.1 | |
| 20:00 | 37.4 | |
| 19:00 | 19.5 | |
| 18:00 | 14 | |
| 17:00 | 14.4 | |
| 16:00 | 20.6 | |
| 15:00 | 21.3 | |
| 14:00 | 22.4 | |
| 13:00 | 21.6 | |
| 12:00 | 23.5 | |
| 11:00 | 22.7 | |
| 10:00 | 45.2 | |
| 09:00 | 71.2 | |
| 08:00 | 37.8 | |
| 07:00 | 24.8 | |
| 06:00 | 24.1 | |
| 05:00 | 22.6 | |
| 04:00 | 26.3 | |
| 03:00 | 30 | |
| 02:00 | 31.3 | |
| 01:00 | 36.3 | |
| Saturday, 10/3 | ||
| 00:00 | 60 | |
| 23:00 | 78.6 | |
| 22:00 | 72.3 | |
| 21:00 | 66.6 | |
| 20:00 | 40.8 | |
| 19:00 | 29.2 | |
| 18:00 | 24.6 | |
| 17:00 | 23.1 | |
| 16:00 | 21.6 | |
| 15:00 | 21.8 | |
| 14:00 | 23.9 | |
| 13:00 | 25.7 | |
| 12:00 | 27.7 | |
| 11:00 | 29.8 | |
| 10:00 | 96.7 | |
| 09:00 | 125.1 | |
| 08:00 | 67.8 | |
| 07:00 | 44.9 | |
| 06:00 | 38.3 | |
| 05:00 | 34.5 | |
| 04:00 | 36 | |
| 03:00 | 45.2 | |
| 02:00 | 56.5 | |
| 01:00 | 72.2 | |
| Friday, 10/2 | ||
| 00:00 | 63.9 | |
| 23:00 | 81.1 | |
| 22:00 | 80.3 | |
| 21:00 | 74.2 | |
| 20:00 | 40 | |
| 19:00 | 19.8 | |
| 18:00 | 18.5 | |
| 17:00 | 25 | |
| 16:00 | 21.7 | |
| 15:00 | 23.9 | |
| 14:00 | 24.2 | |
| 13:00 | 25.6 | |
| 12:00 | 30.9 | |
| 11:00 | 35 | |
| 10:00 | 42.3 | |
| 09:00 | 43.9 | |
| 08:00 | 36.5 | |
| 07:00 | 35.5 | |
| 06:00 | 35.9 | |
| 05:00 | 40.2 | |
| 04:00 | 37 | |
| 03:00 | 33.3 | |
| 02:00 | 36.8 | |
| 01:00 | 40.9 | |
| Thursday, 10/1 | ||
| 00:00 | 45.6 | |
| 23:00 | 47.8 | |
| 22:00 | 55.6 | |
| 21:00 | 49.1 | |
| 20:00 | 26.7 | |
| 19:00 | 18 | |
| 18:00 | 20.2 | |
| 17:00 | 22.6 | |
| 16:00 | 23.1 | |
| 15:00 | 27.9 | |
| 14:00 | 29.4 | |
| 13:00 | 26.3 | |
| 12:00 | 26.4 | |
| 11:00 | 36.1 | |
| 10:00 | 42.5 | |
| 09:00 | 39.2 | |
| 08:00 | 37.4 | |
| 07:00 | 29.2 | |
| 06:00 | 27.3 | |
| 05:00 | 27.3 | |
| 04:00 | 29.7 | |
| 03:00 | 32.6 | |
| 02:00 | 38 | |
| 01:00 | 35.8 | |
| Wednesday, 9/30 | ||
| 00:00 | 34.5 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 79.6 | above the limit · provisional |
| Mon, 10/5 | 73.2 | above the limit · provisional |
| Sun, 10/4 | 34.8 | provisional |
| Sat, 10/3 | 48.5 | provisional |
| Fri, 10/2 | 39.4 | provisional |
| Thu, 10/1 | 33.1 | provisional |
| Wed, 9/30 | 31.4 | provisional |
| Tue, 9/29 | 50.9 | above the limit · provisional |
| Mon, 9/28 | 46 | provisional |
| Sun, 9/27 | 38.2 | provisional |
| Sat, 9/26 | 37 | provisional |
| Fri, 9/25 | 19.7 | provisional |
| Thu, 9/24 | 30.2 | provisional |
| Wed, 9/23 | 22.1 | provisional |
| Tue, 9/22 | 34.9 | provisional |
| Mon, 9/21 | 50.6 | above the limit · provisional |
| Sun, 9/20 | 40 | provisional |
| Sat, 9/19 | 36.9 | provisional |
| Fri, 9/18 | 36 | provisional |
| Thu, 9/17 | 38.8 | provisional |
| Wed, 9/16 | 39 | provisional |
| Tue, 9/15 | 23 | provisional |
| Mon, 9/14 | 40.7 | provisional |
| Sun, 9/13 | 24.3 | provisional |
| Sat, 9/12 | 25 | provisional |
| Fri, 9/11 | 61.8 | above the limit · provisional |
| Thu, 9/10 | 45.1 | provisional |
| Wed, 9/9 | 42.8 | provisional |
| Tue, 9/8 | 31.5 | provisional |
| Mon, 9/7 | 42.8 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 51.4 | 20.4 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | 37.1 | 29.3 | measured in 100 % of hours · provisional |
| August 2026 | 33.5 | 30 | measured in 100 % of hours · provisional |
| July 2026 | 29.8 | 29.8 | measured in 100 % of hours · provisional |
| June 2026 | 29.9 | 36.3 | measured in 100 % of hours · provisional |
| May 2026 | 26.4 | 22.9 | measured in 99 % of hours · provisional |
| April 2026 | 31.7 | 29.2 | measured in 100 % of hours · provisional |
| March 2026 | 47.5 | 46 | measured in 100 % of hours · provisional |
| February 2026 | too few readings | 51.8 | measured in 32 % of hours · provisional |
| January 2026 | too few readings | 49 | |
| December 2025 | 52.9 | 49.9 | measured in 100 % of hours · verified |
| November 2025 | 36.3 | 52.2 | measured in 100 % of hours · verified |
PM10 by year
Yardstick: EU limits (Directive 2008/50/EC)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days above 50 µg/m³ (allowed 35) | ≥ 24² | 64 above the number allowed | 70 above the number allowed |
| Annual average, µg/m³ (EU limit 40) | too few | 37 | 32.2 |
| Highest daily average, µg/m³ | 123March 2 | 157December 18 | 155September 3 |
| Highest hourly value, µg/m³ | 298August 14 | 901July 7 | 404September 2 |
| Hours measured | 82 % | 99 % | 98 % |
| Days without any reading from the station | 0 | 1 | 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.
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.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 45 µg/m³, 18 days allowed. In 2023 there were 36 such days.
- WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2023 there were 36 such days.
- EU from 2030: annual average 20 µg/m³. Average in 2023: 23 µg/m³.
- WHO 2021: annual average 15 µg/m³. Average in 2023: 23 µg/m³.
Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.
The worst days of 2023
| Day | Average | Times the limit |
|---|---|---|
| Dec 26, 2023 | 124 | 2.5 × |
| Dec 19, 2023 | 116 | 2.3 × |
| Dec 18, 2023 | 111 | 2.2 × |
| Jan 1, 2023 | 104 | 2.1 × |
| Dec 25, 2023 | 103 | 2.1 × |
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 8 % of hours · provisional
19.8
Last 7 daysµg/m³
measured in 100 % of hours · provisional
16.7
Last 30 daysµg/m³
measured in 100 % of hours · provisional
20.9
Last 12 monthsµg/m³
measured in 100 % of hours · provisional
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Tuesday, 10/6 | ||
| 00:00 | 44.3 | |
| 23:00 | 50.1 | |
| 22:00 | 49.6 | |
| 21:00 | 44 | |
| 20:00 | 25.8 | |
| 19:00 | 12.5 | |
| 18:00 | 10.6 | |
| 17:00 | 11 | |
| 16:00 | 11.7 | |
| 15:00 | 13.7 | |
| 14:00 | 21.1 | |
| 13:00 | 30.4 | |
| 12:00 | 30.6 | |
| 11:00 | 35.1 | |
| 10:00 | 36.8 | |
| 09:00 | 33.5 | |
| 08:00 | 28.5 | |
| 07:00 | 26.3 | |
| 06:00 | 22.4 | |
| 05:00 | 24.5 | |
| 04:00 | 33.9 | |
| 03:00 | 34.8 | |
| 02:00 | 36.5 | |
| 01:00 | 42 | |
| Monday, 10/5 | ||
| 00:00 | 52.1 | |
| 23:00 | 56.4 | |
| 22:00 | 51.7 | |
| 21:00 | 49.6 | |
| 20:00 | 35.9 | |
| 19:00 | 21.9 | |
| 18:00 | 16.5 | |
| 17:00 | 12.8 | |
| 16:00 | 13.9 | |
| 15:00 | 18.6 | |
| 14:00 | 26.2 | |
| 13:00 | 37.4 | |
| 12:00 | 40.4 | |
| 11:00 | 38.9 | |
| 10:00 | 25.5 | |
| 09:00 | 23.7 | |
| 08:00 | 22.1 | |
| 07:00 | 22.7 | |
| 06:00 | 20.5 | |
| 05:00 | 20.9 | |
| 04:00 | 31.2 | |
| 03:00 | 35.1 | |
| 02:00 | 35.7 | |
| 01:00 | 43.6 | |
| Sunday, 10/4 | ||
| 00:00 | 45.2 | |
| 23:00 | 44.3 | |
| 22:00 | 32.6 | |
| 21:00 | 26.7 | |
| 20:00 | 17.2 | |
| 19:00 | 8.8 | |
| 18:00 | 4.4 | |
| 17:00 | 4.9 | |
| 16:00 | 5.9 | |
| 15:00 | 6.5 | |
| 14:00 | 7.3 | |
| 13:00 | 8.4 | |
| 12:00 | 9.7 | |
| 11:00 | 9.2 | |
| 10:00 | 13.8 | |
| 09:00 | 19.2 | |
| 08:00 | 15.6 | |
| 07:00 | 11.3 | |
| 06:00 | 12.6 | |
| 05:00 | 12.4 | |
| 04:00 | 14.5 | |
| 03:00 | 17.2 | |
| 02:00 | 17.6 | |
| 01:00 | 20.9 | |
| Saturday, 10/3 | ||
| 00:00 | 34.6 | |
| 23:00 | 43.2 | |
| 22:00 | 37.6 | |
| 21:00 | 30.5 | |
| 20:00 | 16.3 | |
| 19:00 | 11.9 | |
| 18:00 | 10.1 | |
| 17:00 | 7.7 | |
| 16:00 | 7.5 | |
| 15:00 | 7.1 | |
| 14:00 | 7.3 | |
| 13:00 | 8.1 | |
| 12:00 | 8.1 | |
| 11:00 | 9 | |
| 10:00 | 23.3 | |
| 09:00 | 30.6 | |
| 08:00 | 21.9 | |
| 07:00 | 15.2 | |
| 06:00 | 14.4 | |
| 05:00 | 15.2 | |
| 04:00 | 16.5 | |
| 03:00 | 25.2 | |
| 02:00 | 31.3 | |
| 01:00 | 42.1 | |
| Friday, 10/2 | ||
| 00:00 | 31.1 | |
| 23:00 | 38.7 | |
| 22:00 | 36.8 | |
| 21:00 | 36.2 | |
| 20:00 | 13.9 | |
| 19:00 | 6.7 | |
| 18:00 | 6.2 | |
| 17:00 | 6.8 | |
| 16:00 | 8.1 | |
| 15:00 | 8.2 | |
| 14:00 | 8.3 | |
| 13:00 | 8.7 | |
| 12:00 | 10.3 | |
| 11:00 | 12.7 | |
| 10:00 | 14.1 | |
| 09:00 | 17.1 | |
| 08:00 | 17.1 | |
| 07:00 | 21.4 | |
| 06:00 | 22.9 | |
| 05:00 | 19.2 | |
| 04:00 | 15.5 | |
| 03:00 | 14.7 | |
| 02:00 | 15.1 | |
| 01:00 | 16.1 | |
| Thursday, 10/1 | ||
| 00:00 | 19.5 | |
| 23:00 | 20.9 | |
| 22:00 | 26.2 | |
| 21:00 | 22.8 | |
| 20:00 | 10 | |
| 19:00 | 6.8 | |
| 18:00 | 6.9 | |
| 17:00 | 6.8 | |
| 16:00 | 7.1 | |
| 15:00 | 8.1 | |
| 14:00 | 8 | |
| 13:00 | 7.8 | |
| 12:00 | 9.5 | |
| 11:00 | 11.9 | |
| 10:00 | 13.7 | |
| 09:00 | 14.1 | |
| 08:00 | 15.4 | |
| 07:00 | 12.7 | |
| 06:00 | 11.7 | |
| 05:00 | 10.9 | |
| 04:00 | 12.2 | |
| 03:00 | 12.6 | |
| 02:00 | 14 | |
| 01:00 | 13.2 | |
| Wednesday, 9/30 | ||
| 00:00 | 13.3 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 29.6 | provisional |
| Mon, 10/5 | 31.4 | provisional |
| Sun, 10/4 | 16.1 | provisional |
| Sat, 10/3 | 19.8 | provisional |
| Fri, 10/2 | 16.9 | provisional |
| Thu, 10/1 | 12.6 | provisional |
| Wed, 9/30 | 12.6 | provisional |
| Tue, 9/29 | 25.8 | provisional |
| Mon, 9/28 | 23.4 | provisional |
| Sun, 9/27 | 25.3 | provisional |
| Sat, 9/26 | 24.5 | provisional |
| Fri, 9/25 | 14.9 | provisional |
| Thu, 9/24 | 9.2 | provisional |
| Wed, 9/23 | 8.8 | provisional |
| Tue, 9/22 | 12.3 | provisional |
| Mon, 9/21 | 17.6 | provisional |
| Sun, 9/20 | 21.9 | provisional |
| Sat, 9/19 | 17.5 | provisional |
| Fri, 9/18 | 13.2 | provisional |
| Thu, 9/17 | 14.7 | provisional |
| Wed, 9/16 | 20.7 | provisional |
| Tue, 9/15 | 16.5 | provisional |
| Mon, 9/14 | 13.3 | provisional |
| Sun, 9/13 | 12.4 | provisional |
| Sat, 9/12 | 10.5 | provisional |
| Fri, 9/11 | 14.5 | provisional |
| Thu, 9/10 | 11 | provisional |
| Wed, 9/9 | 11.7 | provisional |
| Tue, 9/8 | 10.5 | provisional |
| Mon, 9/7 | 12.2 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 21.1 | 14.7 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | 14.1 | 12.5 | measured in 100 % of hours · provisional |
| August 2026 | 11.6 | 10.7 | measured in 100 % of hours · provisional |
| July 2026 | 10.5 | 10.2 | measured in 100 % of hours · provisional |
| June 2026 | 11.1 | 13.1 | measured in 100 % of hours · provisional |
| May 2026 | 10.5 | 12.1 | measured in 99 % of hours · provisional |
| April 2026 | 16.1 | 15.3 | measured in 100 % of hours · provisional |
| March 2026 | 28.3 | 27.9 | measured in 100 % of hours · provisional |
| February 2026 | 26.5 | 39.2 | measured in 100 % of hours · provisional |
| January 2026 | 36.9 | 36.5 | measured in 100 % of hours · provisional |
| December 2025 | 40 | 40.6 | measured in 100 % of hours · verified |
| November 2025 | 25.7 | 41.5 | measured in 100 % of hours · verified |
PM2.5 by year
Yardstick: EU limits (Directive 2008/50/EC)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Annual average, µg/m³ (EU limit 25) | 18.4* | 21.8 | 21.3 |
| Highest daily average, µg/m³ | 95January 15 | 113December 18 | 108December 19 |
| Highest hourly value, µg/m³ | 164January 13 | 144February 24 | 165December 19 |
| Hours measured | 100 % | 99 % | 96 % |
| Days without any reading from the station | 0 | 1 | 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.
Nitrogen dioxide NO₂
157.8
Nowµg/m³
Measured at 21:00
98.9
Last 24 hoursµg/m³
measured in 96 % of hours · provisional
68.2
Last 7 daysµg/m³
measured in 98 % of hours · provisional
51
Last 30 daysµg/m³
measured in 98 % of hours · provisional
40.9
Last 12 monthsµg/m³
measured in 98 % of hours · provisional
Days in 2023: NO₂, at least one hour above 200 µg/m³
No measured day above the limit.
- above the limit
- below the limit
- too few readings for the day
- no NO₂ data in the EEA database
Months of 2023
| Month | Days with an hour above 200 | Hours above 200 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 56 | 0 |
| February | 0 | 0 | 68 | 0 |
| March | 0 | 0 | 75 | 0 |
| April | 0 | 0 | 59 | 0 |
| May | 0 | 0 | 54 | 0 |
| June | 0 | 0 | 52 | 0 |
| July | 0 | |||
| August | 0 | |||
| September | 0 | 0 | 80 | 0 |
| October | 0 | 0 | 75 | 0 |
| November | 0 | 0 | 55 | 0 |
| December | 0 | 0 | 73 | 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 | ||
| 22:00 | 41 | model estimate, not counted |
| 21:00 | 157.8 | |
| 20:00 | 156 | |
| 19:00 | 106.4 | |
| 18:00 | 78.3 | |
| 17:00 | 65.7 | |
| 16:00 | 57.4 | |
| 15:00 | 51.9 | |
| 14:00 | 87.8 | |
| 13:00 | 103.6 | |
| 12:00 | 97.4 | |
| 11:00 | 85.1 | |
| 10:00 | 90.7 | |
| 09:00 | 86.6 | |
| 08:00 | 89.4 | |
| 07:00 | 83.6 | |
| 06:00 | 78.4 | |
| 05:00 | 81.3 | |
| 04:00 | 89.8 | |
| 03:00 | 100.1 | |
| 02:00 | 116.2 | |
| 01:00 | 122.4 | |
| Tuesday, 10/6 | ||
| 00:00 | 136.7 | |
| 23:00 | 152.3 | |
| 22:00 | 155.7 | |
| 21:00 | 161.4 | |
| 20:00 | 150 | |
| 19:00 | 66.1 | |
| 18:00 | 43.4 | |
| 17:00 | 26.1 | |
| 16:00 | 27.7 | |
| 15:00 | 30 | |
| 14:00 | 53.7 | |
| 13:00 | 85.6 | |
| 12:00 | 73.5 | |
| 11:00 | 91.4 | |
| 10:00 | 94.7 | |
| 09:00 | 119.1 | |
| 08:00 | 96.6 | |
| 07:00 | 78 | |
| 05:00 | 70.5 | |
| 04:00 | 80.6 | |
| 03:00 | 91.4 | |
| 02:00 | 107.8 | |
| 01:00 | 119.6 | |
| Monday, 10/5 | ||
| 00:00 | 137.9 | |
| 23:00 | 149.8 | |
| 22:00 | 150.2 | |
| 21:00 | 158.5 | |
| 20:00 | 144.1 | |
| 19:00 | 56.4 | |
| 18:00 | 28.1 | |
| 17:00 | 43 | |
| 16:00 | 25.6 | |
| 15:00 | 43.3 | |
| 14:00 | 65.4 | |
| 13:00 | 62.8 | |
| 12:00 | 56.5 | |
| 11:00 | 64.1 | |
| 10:00 | 68.3 | |
| 09:00 | 79.4 | |
| 08:00 | 81.5 | |
| 07:00 | 70.3 | |
| 06:00 | 62.7 | |
| 05:00 | 59.8 | |
| 04:00 | 75.6 | |
| 03:00 | 93.3 | |
| 02:00 | 96.4 | |
| 01:00 | 118 | |
| Sunday, 10/4 | ||
| 00:00 | 125.2 | |
| 23:00 | 135.4 | |
| 22:00 | 132.3 | |
| 21:00 | 135.7 | |
| 20:00 | 106.9 | |
| 19:00 | 40.7 | |
| 18:00 | 26.1 | |
| 17:00 | 21.3 | |
| 16:00 | 16.8 | |
| 15:00 | 17.2 | |
| 14:00 | 16.5 | |
| 13:00 | 21 | |
| 12:00 | 23.2 | |
| 11:00 | 22.1 | |
| 10:00 | 45.5 | |
| 09:00 | 76.9 | |
| 08:00 | 80.8 | |
| 07:00 | 26.3 | |
| 06:00 | 26.6 | |
| 05:00 | 27.7 | |
| 04:00 | 52.1 | |
| 03:00 | 74.6 | |
| 02:00 | 78.3 | |
| 01:00 | 87.9 | |
| Saturday, 10/3 | ||
| 00:00 | 98.5 | |
| 23:00 | 116.7 | |
| 22:00 | 120.2 | |
| 21:00 | 128.3 | |
| 20:00 | 96 | |
| 19:00 | 55.9 | |
| 18:00 | 26.7 | |
| 17:00 | 26.9 | |
| 16:00 | 30.4 | |
| 15:00 | 16.4 | |
| 14:00 | 26.1 | |
| 13:00 | 24.3 | |
| 12:00 | 26.5 | |
| 11:00 | 23.4 | |
| 10:00 | 54.8 | |
| 09:00 | 89.3 | |
| 08:00 | 96.5 | |
| 07:00 | 75.2 | |
| 06:00 | 81.9 | |
| 04:00 | 83.6 | |
| 03:00 | 93.6 | |
| 02:00 | 105.5 | |
| 01:00 | 106.8 | |
| Friday, 10/2 | ||
| 00:00 | 105.2 | |
| 23:00 | 121.8 | |
| 22:00 | 123.4 | |
| 21:00 | 126.5 | |
| 20:00 | 109.4 | |
| 19:00 | 43.6 | |
| 18:00 | 44.8 | |
| 17:00 | 32.3 | |
| 16:00 | 27.7 | |
| 15:00 | 25.3 | |
| 14:00 | 24.9 | |
| 13:00 | 32.7 | |
| 12:00 | 38.9 | |
| 11:00 | 48.4 | |
| 10:00 | 70.3 | |
| 09:00 | 91.8 | |
| 08:00 | 79.4 | |
| 07:00 | 65.9 | |
| 06:00 | 46.6 | |
| 05:00 | 39.9 | |
| 04:00 | 66 | |
| 03:00 | 78 | |
| 02:00 | 90.4 | |
| 01:00 | 95.6 | |
| Thursday, 10/1 | ||
| 00:00 | 98.7 | |
| 23:00 | 99.6 | |
| 22:00 | 105.7 | |
| 21:00 | 123.4 | |
| 20:00 | 70.2 | |
| 19:00 | 39.3 | |
| 18:00 | 41.3 | |
| 17:00 | 35.3 | |
| 16:00 | 27.3 | |
| 15:00 | 23.6 | |
| 14:00 | 24.4 | |
| 13:00 | 31.4 | |
| 12:00 | 29.9 | |
| 11:00 | 33.8 | |
| 10:00 | 56.9 | |
| 09:00 | 63.9 | |
| 08:00 | 78.6 | |
| 07:00 | 50.3 | |
| 06:00 | 27.5 | |
| 05:00 | 29.1 | |
| 04:00 | 40.5 | |
| 03:00 | 65.1 | |
| 02:00 | 76.5 | |
| 01:00 | 49.7 | |
| Wednesday, 9/30 | ||
| 00:00 | 48.3 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 91.8 | provisional |
| Mon, 10/5 | 83 | provisional |
| Sun, 10/4 | 59 | provisional |
| Sat, 10/3 | 69.7 | provisional |
| Fri, 10/2 | 67.9 | provisional |
| Thu, 10/1 | 55.1 | provisional |
| Wed, 9/30 | 50.9 | provisional |
| Tue, 9/29 | 66.8 | provisional |
| Mon, 9/28 | 61.2 | provisional |
| Sun, 9/27 | 49.4 | provisional |
| Sat, 9/26 | 38.8 | provisional |
| Fri, 9/25 | 33.6 | provisional |
| Thu, 9/24 | 43.1 | provisional |
| Wed, 9/23 | 35 | provisional |
| Tue, 9/22 | 31.7 | provisional |
| Mon, 9/21 | 46 | provisional |
| Sun, 9/20 | 62.9 | provisional |
| Sat, 9/19 | 57.3 | provisional |
| Fri, 9/18 | 39.2 | provisional |
| Thu, 9/17 | 59.1 | provisional |
| Wed, 9/16 | 62.9 | provisional |
| Tue, 9/15 | 35.3 | provisional |
| Mon, 9/14 | 46.2 | provisional |
| Sun, 9/13 | 29.9 | provisional |
| Sat, 9/12 | 18.3 | provisional |
| Fri, 9/11 | 42.1 | provisional |
| Thu, 9/10 | 27.8 | provisional |
| Wed, 9/9 | 44.7 | provisional |
| Tue, 9/8 | 62.2 | provisional |
| Mon, 9/7 | 60.6 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 70.9 | 32.8 | measured in 99 % of hours · provisional · year before: same days |
| September 2026 | 44.4 | 42.4 | measured in 98 % of hours · provisional |
| August 2026 | 42.8 | 45.7 | measured in 99 % of hours · provisional |
| July 2026 | 38.2 | 38.4 | measured in 99 % of hours · provisional |
| June 2026 | 40.6 | 41.5 | measured in 98 % of hours · provisional |
| May 2026 | 36.4 | 35.6 | measured in 98 % of hours · provisional |
| April 2026 | 35.7 | 36.1 | measured in 99 % of hours · provisional |
| March 2026 | 40.3 | 46.4 | measured in 97 % of hours · provisional |
| February 2026 | 38.4 | 39.2 | measured in 99 % of hours · provisional |
| January 2026 | 43.9 | 40.9 | measured in 99 % of hours · provisional |
| December 2025 | 40.5 | 42 | measured in 99 % of hours · verified |
| November 2025 | 39 | 46.1 | measured in 91 % of hours · verified |
NO₂ by year
Yardstick: EU limits (Directive 2008/50/EC)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Hours above 200 µg/m³ (allowed 18) | 0 | 5 | 0 |
| Hours above 400 µg/m³, three hours in a row (alert threshold) | 0 | 0 | 0 |
| Annual average, µg/m³ (EU limit 40) | 40.8* | 40.7 above the number allowed | 43.1 above the number allowed |
| Highest daily average, µg/m³ | 114January 15 | 128August 12 | 90February 7 |
| Highest hourly value, µg/m³ | 179January 15 | 266August 12 | 169August 28 |
| Hours measured | 98 % | 97 % | 98 % |
| Days without any reading from the station | 0 | 1 | 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 warning and alert thresholds: every such hour or day is in red.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there were 48 such days.
- WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2023 there were 230 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
46
Nowµg/m³
Measured at 21:00
21.4
Last 24 hoursµg/m³
measured in 92 % of hours · provisional
10.4
Last 7 daysµg/m³
measured in 99 % of hours · provisional
9
Last 30 daysµg/m³
measured in 98 % of hours · provisional
8.5
Last 12 monthsµg/m³
measured in 98 % of hours · provisional
Days in 2023: SO₂, daily average above 125 µg/m³
No measured day above the limit.
- above the limit
- below the limit
- too few readings for the day
- no SO₂ data in the EEA database
Months of 2023
| Month | Days above 125 | Hours above 350 | Highest day | No readings |
|---|---|---|---|---|
| January | 0 | 0 | 18 | 0 |
| February | 0 | 0 | 21 | 0 |
| March | 0 | 0 | 28 | 0 |
| April | 0 | 0 | 12 | 0 |
| May | 0 | 0 | 9 | 0 |
| June | 0 | 0 | 8 | 0 |
| July | 0 | 0 | 17 | 0 |
| August | 0 | 0 | 12 | 0 |
| September | 0 | 0 | 14 | 0 |
| October | 0 | 0 | 20 | 0 |
| November | 0 | 0 | 20 | 0 |
| December | 0 | 0 | 25 | 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 | ||
| 21:00 | 46 | |
| 20:00 | 49.7 | |
| 19:00 | 61 | |
| 18:00 | 52 | |
| 17:00 | 13.4 | |
| 16:00 | 13.3 | |
| 15:00 | 13.2 | |
| 14:00 | 23.7 | |
| 13:00 | 17.1 | |
| 12:00 | 17.4 | |
| 11:00 | 17.4 | |
| 09:00 | 15.4 | |
| 08:00 | 13.3 | |
| 07:00 | 11.5 | |
| 06:00 | 9.2 | |
| 05:00 | 9.5 | |
| 04:00 | 10.4 | |
| 03:00 | 11.7 | |
| 02:00 | 13.5 | |
| 01:00 | 14.9 | |
| Tuesday, 10/6 | ||
| 00:00 | 17.5 | |
| 23:00 | 20.1 | |
| 22:00 | 19.6 | |
| 21:00 | 20.8 | |
| 20:00 | 22.8 | |
| 19:00 | 15.1 | |
| 18:00 | 12.1 | |
| 17:00 | 11.9 | |
| 16:00 | 12.4 | |
| 15:00 | 11.9 | |
| 14:00 | 11.5 | |
| 13:00 | 13.5 | |
| 12:00 | 12.9 | |
| 11:00 | 12.9 | |
| 10:00 | 15.6 | |
| 09:00 | 19.9 | |
| 08:00 | 15.1 | |
| 07:00 | 10.5 | |
| 06:00 | 7.3 | |
| 05:00 | 7.7 | |
| 04:00 | 8.8 | |
| 03:00 | 10.7 | |
| 02:00 | 12.6 | |
| 01:00 | 14.4 | |
| Monday, 10/5 | ||
| 00:00 | 17.7 | |
| 23:00 | 19.8 | |
| 22:00 | 18.9 | |
| 21:00 | 21.5 | |
| 20:00 | 14.9 | |
| 19:00 | 7.9 | |
| 18:00 | 9 | |
| 17:00 | 9 | |
| 16:00 | 9.2 | |
| 15:00 | 10.6 | |
| 14:00 | 12.1 | |
| 13:00 | 14.2 | |
| 12:00 | 13.6 | |
| 11:00 | 14.4 | |
| 10:00 | 13 | |
| 09:00 | 14.6 | |
| 08:00 | 13.3 | |
| 07:00 | 10.4 | |
| 06:00 | 8.1 | |
| 05:00 | 8.3 | |
| 04:00 | 10.4 | |
| 03:00 | 13.4 | |
| 02:00 | 13.6 | |
| 01:00 | 16.8 | |
| Sunday, 10/4 | ||
| 00:00 | 16.7 | |
| 23:00 | 17.6 | |
| 22:00 | 17.4 | |
| 21:00 | 18.1 | |
| 20:00 | 11.7 | |
| 19:00 | 7.6 | |
| 18:00 | 6.2 | |
| 17:00 | 6.1 | |
| 16:00 | 5.9 | |
| 15:00 | 6.7 | |
| 14:00 | 6.2 | |
| 13:00 | 6.1 | |
| 12:00 | 6 | |
| 11:00 | 6 | |
| 10:00 | 7 | |
| 08:00 | 8.1 | |
| 07:00 | 6.2 | |
| 06:00 | 6.3 | |
| 05:00 | 6.3 | |
| 04:00 | 6.9 | |
| 03:00 | 7 | |
| 02:00 | 7.4 | |
| 01:00 | 10 | |
| Saturday, 10/3 | ||
| 00:00 | 14 | |
| 23:00 | 18.1 | |
| 22:00 | 17.4 | |
| 21:00 | 19.9 | |
| 20:00 | 21.3 | |
| 19:00 | 25.8 | |
| 18:00 | 17.1 | |
| 17:00 | 7.6 | |
| 16:00 | 7.1 | |
| 15:00 | 6.7 | |
| 14:00 | 6.5 | |
| 13:00 | 6.2 | |
| 12:00 | 5.9 | |
| 11:00 | 6.2 | |
| 10:00 | 8.7 | |
| 09:00 | 13.5 | |
| 08:00 | 13 | |
| 07:00 | 8.1 | |
| 06:00 | 8.3 | |
| 05:00 | 8.5 | |
| 04:00 | 8.6 | |
| 03:00 | 11.3 | |
| 02:00 | 13.3 | |
| 01:00 | 14.5 | |
| Friday, 10/2 | ||
| 00:00 | 14 | |
| 23:00 | 18.3 | |
| 22:00 | 18.2 | |
| 21:00 | 18.4 | |
| 20:00 | 15.4 | |
| 19:00 | 7.4 | |
| 18:00 | 7.5 | |
| 17:00 | 16.5 | |
| 16:00 | 8.8 | |
| 15:00 | 7 | |
| 14:00 | 7 | |
| 13:00 | 6.5 | |
| 12:00 | 6.4 | |
| 11:00 | 6.7 | |
| 10:00 | 7.6 | |
| 09:00 | 10.5 | |
| 08:00 | 8.5 | |
| 07:00 | 8.9 | |
| 06:00 | 6.2 | |
| 05:00 | 5.8 | |
| 04:00 | 6.2 | |
| 03:00 | 6.6 | |
| 02:00 | 7.2 | |
| 01:00 | 8.7 | |
| Thursday, 10/1 | ||
| 00:00 | 9.7 | |
| 23:00 | 9.4 | |
| 22:00 | 11.2 | |
| 21:00 | 13.6 | |
| 20:00 | 7.3 | |
| 19:00 | 6.7 | |
| 18:00 | 6.8 | |
| 17:00 | 6.6 | |
| 16:00 | 6.4 | |
| 15:00 | 6.4 | |
| 14:00 | 6.3 | |
| 13:00 | 6.2 | |
| 12:00 | 6.2 | |
| 11:00 | 6.4 | |
| 10:00 | 7.3 | |
| 09:00 | 6.7 | |
| 07:00 | 6.4 | |
| 06:00 | 6 | |
| 05:00 | 5.9 | |
| 04:00 | 5.9 | |
| 03:00 | 6.4 | |
| 02:00 | 6.8 | |
| 01:00 | 6.2 | |
| Wednesday, 9/30 | ||
| 00:00 | 6.3 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 14.1 | provisional |
| Mon, 10/5 | 13.1 | provisional |
| Sun, 10/4 | 8.8 | provisional |
| Sat, 10/3 | 12 | provisional |
| Fri, 10/2 | 9.8 | provisional |
| Thu, 10/1 | 7.2 | provisional |
| Wed, 9/30 | 7.4 | provisional |
| Tue, 9/29 | 10.2 | provisional |
| Mon, 9/28 | 10.2 | provisional |
| Sun, 9/27 | 9.5 | provisional |
| Sat, 9/26 | 7.6 | provisional |
| Fri, 9/25 | 6.6 | provisional |
| Thu, 9/24 | 9.3 | provisional |
| Wed, 9/23 | 7.1 | provisional |
| Tue, 9/22 | 7.2 | provisional |
| Mon, 9/21 | 7.2 | provisional |
| Sun, 9/20 | 8.6 | provisional |
| Sat, 9/19 | 8.1 | provisional |
| Fri, 9/18 | 7.8 | provisional |
| Thu, 9/17 | 11.1 | provisional |
| Wed, 9/16 | 9.5 | provisional |
| Tue, 9/15 | 7.9 | provisional |
| Mon, 9/14 | 8.2 | provisional |
| Sun, 9/13 | 7.5 | provisional |
| Sat, 9/12 | 7.2 | provisional |
| Fri, 9/11 | 9.7 | provisional |
| Thu, 9/10 | 7.9 | provisional |
| Wed, 9/9 | 9 | provisional |
| Tue, 9/8 | 9.1 | provisional |
| Mon, 9/7 | 10.1 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 10.9 | 11.5 | measured in 99 % of hours · provisional · year before: same days |
| September 2026 | 8.4 | 9.9 | measured in 98 % of hours · provisional |
| August 2026 | 9.1 | 8.7 | measured in 99 % of hours · provisional |
| July 2026 | 7.8 | 10.2 | measured in 99 % of hours · provisional |
| June 2026 | 6.9 | 10.7 | measured in 98 % of hours · provisional |
| May 2026 | 6.9 | 10.1 | measured in 97 % of hours · provisional |
| April 2026 | 7.2 | 8.2 | measured in 98 % of hours · provisional |
| March 2026 | 9.5 | 9.9 | measured in 98 % of hours · provisional |
| February 2026 | 9 | 9.3 | measured in 99 % of hours · provisional |
| January 2026 | 6.1 | 11.2 | measured in 98 % of hours · provisional |
| December 2025 | 8.5 | 10.7 | measured in 99 % of hours · verified |
| November 2025 | 8.8 | 12 | measured in 91 % of hours · verified |
SO₂ by year
Yardstick: EU limits (Directive 2008/50/EC)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days above 125 µg/m³ (allowed 3) | 0 | 0 | 0 |
| Hours above 350 µg/m³ (allowed 24) | 0 | 0 | 0 |
| Hours above 500 µg/m³, three hours in a row (alert threshold) | 0 | 0 | 0 |
| Annual average, µg/m³ | 7.9* | 10 | 10.5 |
| Highest daily average, µg/m³ | 20March 4 | 39June 25 | 34February 7 |
| Highest hourly value, µg/m³ | 106May 5 | 244June 25 | 63September 18 |
| Hours measured | 98 % | 97 % | 97 % |
| Days without any reading from the station | 0 | 1 | 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.
■ and a figure in red: more than is allowed for the whole year.
There is no allowed number for the warning and alert thresholds: every such hour or day is in red.
The column for 2023 is shown on wider screens.
Compared with the new EU rules and the WHO recommendation
This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.
- EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there were 0 such days.
- WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2023 there were 0 such days.
- EU from 2030: annual average 20 µg/m³. Average in 2023: 9 µg/m³.
Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.
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: 0
Timeline of outages from October 7, 2025 to today
In the last 12 months this station had no outage of 24 hours or longer.
Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.
Where the data comes from
Measured by Agency for Environmental Protection. 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 EU limits come from Directive 2008/50/EC. Here they serve as a yardstick for comparison. 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.