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Air at the Kopaonik station

Raška, Serbia

Network: Agency for Environmental Protection · Station code: RS0047A

This year, up to yesterday (October 6)

at least

48 days

with an 8-hour average of ozone (O₃) above the target value of 120 µg/m³.

The target value allows 25 such days a year, averaged over three years.

In 2025: 42 days above the limit, the target value allows 25 as a three-year average.

Worst day: July 19, 2026, O₃ 151 µg/m³ as a daily average, 1.3 times the limit.

Daily average for 182 of 279 days · data for 2026 not yet finally verified · Yardstick: EU limits (Directive 2008/50/EC)

All figures by year and month

Moderate

Air now · Measured at 20:00

Latest values

Latest value: 20:00

Readings
PollutantValueLevel
O₃110.3 µg/m³Moderate
SO₂10.5 µg/m³Good

How the air is changing

Over the last seven days there was more O₃ in the air than the week before.

  • O₃: average 92.2 µg/m³, week before 75.6 µg/m³
  • SO₂: average 8.3 µg/m³, week before 8.6 µg/m³

Last month there was less O₃ in the air than the month before.

  • O₃: average 91.7 µg/m³, month before 112.9 µg/m³
  • SO₂: average 9.1 µg/m³, month before 8.2 µg/m³

Show

Ozone O₃

110.3

Nowµg/m³

Measured at 20:00

98.6

Last 24 hoursµg/m³

measured in 96 % of hours · provisional

92.2

Last 7 daysµg/m³

measured in 98 % of hours · provisional

90.3

Last 30 daysµg/m³

measured in 99 % of hours · provisional

too few readings

Last 12 months

measured in 72 % of hours · provisional

Days in 2025: O₃, 8-hour average above 120 µg/m³

42 days above the limit.

1102031JanFebMarMar 9: 127 µg/m³, above the limitAprApr 30: 121 µg/m³, above the limitMayMay 1: 137 µg/m³, above the limitMay 2: 137 µg/m³, above the limitMay 3: 130 µg/m³, above the limitMay 4: 128 µg/m³, above the limitMay 5: 125 µg/m³, above the limitMay 15: 122 µg/m³, above the limitMay 20: 121 µg/m³, above the limitJunJun 11: 125 µg/m³, above the limitJun 12: 129 µg/m³, above the limitJun 13: 140 µg/m³, above the limitJun 14: 141 µg/m³, above the limitJun 15: 131 µg/m³, above the limitJun 16: 126 µg/m³, above the limitJun 17: 127 µg/m³, above the limitJun 24: 126 µg/m³, above the limitJun 25: 123 µg/m³, above the limitJun 27: 121 µg/m³, above the limitJulJul 1: 126 µg/m³, above the limitJul 2: 128 µg/m³, above the limitJul 4: 135 µg/m³, above the limitJul 5: 140 µg/m³, above the limitJul 6: 128 µg/m³, above the limitJul 7: 122 µg/m³, above the limitJul 14: 130 µg/m³, above the limitJul 15: 135 µg/m³, above the limitJul 16: 121 µg/m³, above the limitJul 23: 123 µg/m³, above the limitJul 24: 129 µg/m³, above the limitJul 25: 121 µg/m³, above the limitJul 26: 121 µg/m³, above the limitAugAug 2: 126 µg/m³, above the limitAug 3: 121 µg/m³, above the limitAug 9: 121 µg/m³, above the limitAug 11: 128 µg/m³, above the limitAug 12: 126 µg/m³, above the limitAug 21: 127 µg/m³, above the limitAug 22: 123 µg/m³, above the limitAug 28: 149 µg/m³, above the limitAug 29: 143 µg/m³, above the limitSepSep 6: 122 µg/m³, above the limitOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
Days above the limit with values (42)
  1. Mar 9 127
  2. Apr 30 121
  3. May 1 137
  4. May 2 137
  5. May 3 130
  6. May 4 128
  7. May 5 125
  8. May 15 122
  9. May 20 121
  10. Jun 11 125
  11. Jun 12 129
  12. Jun 13 140
  13. Jun 14 141
  14. Jun 15 131
  15. Jun 16 126
  16. Jun 17 127
  17. Jun 24 126
  18. Jun 25 123
  19. Jun 27 121
  20. Jul 1 126
  21. Jul 2 128
  22. Jul 4 135
  23. Jul 5 140
  24. Jul 6 128
  25. Jul 7 122
  26. Jul 14 130
  27. Jul 15 135
  28. Jul 16 121
  29. Jul 23 123
  30. Jul 24 129
  31. Jul 25 121
  32. Jul 26 121
  33. Aug 2 126
  34. Aug 3 121
  35. Aug 9 121
  36. Aug 11 128
  37. Aug 12 126
  38. Aug 21 127
  39. Aug 22 123
  40. Aug 28 149
  41. Aug 29 143
  42. Sep 6 122

Values in µg/m³, limit 120 µg/m³.

Months of 2025

MonthDays above 120Highest 8 hNo readings
January0990
February01040
March1 above the number allowed1270
April1 above the number allowed1210
May7 above the number allowed1370
June10 above the number allowed1410
July13 above the number allowed1400
August9 above the number allowed1490
September1 above the number allowed1220
October0990
November0970
December0990

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.

Last 7 days, every hour: O₃ in µg/m³highest 125 µg/m³, latest 111 µg/m³ (19:00)050100150ThuFriSatSunMonTueWedhighest 125latest 111 (19:00)
measured
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
19:00111.4
18:00116
17:00114.1
16:00112.1
15:00111
14:00110.1
13:00110.2
12:00109.3
11:00109.2
10:00106.1
09:0099.3
08:0083.5
07:0081.5
06:0082.6
05:0084.2
04:0098.6
03:00102.5
02:00107
01:00100.4
Tuesday, 10/6
00:0073.4
23:0072.3
22:0055.6
21:00118.6
20:00112.8
19:00121.2
18:00125.1
17:00118.2
16:00114.5
15:00111.7
14:00110.5
13:00111.2
12:00111
11:00111.2
10:0091.1
09:0049.6
08:0065.9
07:0081.4
06:0080.9
05:0081.2
03:0082.4
02:0080.5
01:0080.5
Monday, 10/5
00:0078.7
23:0079.1
22:0093
21:0095.7
20:0083.5
19:00101.1
18:00106.5
17:00106
16:00106.5
15:00105.2
14:00104.5
13:00103
12:00103
11:00100.8
10:0087
09:0058.1
08:0074.1
07:0079.1
06:0081.3
05:0098.2
04:0099.7
03:0091.4
02:0094.3
01:0093
Sunday, 10/4
00:0097.8
23:0098.4
22:0093.5
21:0093.4
20:0096.3
19:0098.2
18:0098.7
17:0098.7
16:00100.3
15:0096.2
14:0095.3
13:0098.7
12:0099.1
11:0096.5
10:0091.9
09:0089.7
08:0095.5
07:0094.2
06:0093.7
05:0091.8
04:0094.6
03:00100
02:0089.8
01:0087.9
Saturday, 10/3
00:0090.8
23:0090.5
22:0078.2
21:0088.6
20:0097.5
19:0097.9
18:0097.8
17:0096.8
16:0094.7
15:0092.6
14:0092.9
13:0093
12:0094.5
11:0094.4
10:0096.1
09:0095.4
08:0096.2
07:0095.3
06:0096
05:0096.1
04:0096.8
02:0096
01:0095.5
Friday, 10/2
00:0097.6
23:00100.2
22:0099.7
21:0094.3
20:0092.4
19:0099.6
18:00101.5
17:00100.4
16:0098.8
15:0098
14:0096.8
13:0097.2
12:0094.4
11:0093.2
10:0090.7
09:0088.6
08:0091.4
07:0091.8
06:0093
05:0093
04:0094.2
03:0091.7
02:0092.2
01:0090.4
Thursday, 10/1
00:0088.1
23:0087.3
22:0091.1
21:0090.8
20:0091.4
19:0093.9
18:0094.6
17:0091.1
16:0091.6
15:0090.4
14:0088
13:0090
12:0090.5
11:0088.7
10:0086.1
09:0085.4
08:0087.4
07:0088.2
06:0088.5
05:0086.7
04:0089.7
03:0088.2
02:0085.4
01:0086.8
Wednesday, 9/30
00:0086.4
23:0085.3
22:0083.1
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 3 days above the limithighest 146 µg/m³, latest 117 µg/m³0501001509/99/169/239/30highest 146latest 117
day above the limittarget value, 120 µg/m³
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 3 days above the limit
Values as a table
Dayµg/m³Note
Tue, 10/6116.6provisional
Mon, 10/5104.5provisional
Sun, 10/498.2provisional
Sat, 10/397.6provisional
Fri, 10/298.4provisional
Thu, 10/191.9provisional
Wed, 9/3087.6provisional
Tue, 9/2996.8provisional
Mon, 9/2898.2provisional
Sun, 9/2785.9provisional
Sat, 9/2682.3provisional
Fri, 9/2580.5provisional
Thu, 9/2477.6provisional
Wed, 9/2368.8provisional
Tue, 9/2281.7provisional
Mon, 9/21105.6provisional
Sun, 9/20111.9provisional
Sat, 9/1999.7provisional
Fri, 9/18109.1provisional
Thu, 9/17110.4provisional
Wed, 9/1694.4provisional
Tue, 9/1591.8provisional
Mon, 9/1499.2provisional
Sun, 9/1399.2provisional
Sat, 9/12115.3provisional
Fri, 9/11138.7above the limit · provisional
Thu, 9/10144above the limit · provisional
Wed, 9/9146above the limit · provisional
Tue, 9/8116provisional
Mon, 9/7103.5provisional
Last 12 months, monthly average: O₃ in µg/m³highest 113 µg/m³, latest 93 µg/m³050100150DecFebAprJunAugOcthighest 113latest 93
Last 12 monthsthis month so fara year earliermonth with days without data from the station
Last 12 months, monthly average: O₃ in µg/m³
Values as a table
Monthµg/m³a year earlierNote
October 2026 so far93.467.6measured in 99 % of hours · provisional · year before: same days
September 202691.785.6measured in 99 % of hours · provisional
August 2026112.9104.5measured in 99 % of hours · provisional
July 202695.899.8measured in 96 % of hours · provisional
June 202699.3105measured in 98 % of hours · provisional
May 2026107.8105.1measured in 98 % of hours · provisional
April 202610894.1measured in 81 % of hours · provisional · 5 days without data from the station
March 2026too few readings91.431 days without data from the station
February 2026too few readings78.928 days without data from the station
January 2026too few readings77.131 days without data from the station
December 202576.867.6measured in 96 % of hours · verified
November 202574.860.3measured in 99 % of hours · verified

O₃ by year

Yardstick: EU limits (Directive 2008/50/EC)

Measure2026*20252024
Days with 8-hour average above 120 µg/m³ (target value 25)≥ 484241
Annual average, µg/m³too few89.188.5
Highest 8-hour average, µg/m³151July 19149August 28149July 20
Hours measured65 %98 %98 %
Days without any reading from the station9502

* 2026 up to October 6; the average since the start of the year is not yet an annual average.

The monitoring networks have not yet finally verified this year’s data. The EEA publishes verified values once a year.

≥ means at least: more than a tenth of the days or hours are missing, so the real number may be higher.

■ and a figure in red: more than is allowed for the whole year.

The column for 2023 is shown on wider screens.

The worst days of 2025

DayHighest 8 hTimes the limit
Aug 28, 20251491.2 ×
Aug 29, 20251431.2 ×
Jun 14, 20251411.2 ×
Jun 13, 20251401.2 ×
Jul 5, 20251401.2 ×

Daily average in µg/m³, daily limit 120 µg/m³. Days with the same unverified value over many hours are not on this list.

Outages in the last 12 months

Every period of at least 24 hours in which no reading arrived from this station.

Days without a reading: 95

1 outage, 2,280 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

FromToDuration
Jan 1, 2026 00:00Apr 6, 2026 01:0095 days

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.

How we measure

samoEKO is a brand of samoLabs, Juelich.