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Air at the Ljubljana Bezigrad station

Ljubljana, Slovenia

Network: Slovenian Environment Agency · Station code: SI0003A

This year, up to yesterday (October 7)

51 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: 24 days above the limit, the target value allows 25 as a three-year average.

3 days

with a daily average of particulate matter PM10 above the EU limit of 50 µg/m³.

35 days are allowed in the whole year.

Worst day: August 16, 2026, O₃ 160 µg/m³ as a daily average, 1.3 times the limit.

Daily average for 274 of 280 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 00:00

Latest values

Latest value: 00:00

Readings
PollutantValueLevel
PM1026.9 µg/m³Fair
NO₂35.4 µg/m³Moderate
O₃12.4 µg/m³Good

How the air is changing

Over the last seven days there was more PM10, PM2.5, and NO₂ in the air than the week before.

  • PM10: average 27.4 µg/m³, week before 18.7 µg/m³
  • PM2.5: average 15.4 µg/m³, week before 10.9 µg/m³
  • NO₂: average 27.7 µg/m³, week before 20.2 µg/m³
  • O₃: average 34.9 µg/m³, week before 36.8 µg/m³

Last month there was more NO₂ and less PM10, PM2.5, and O₃ in the air than the month before.

  • PM10: average 13.8 µg/m³, month before 16 µg/m³
  • PM2.5: average 7.3 µg/m³, month before 8.8 µg/m³
  • NO₂: average 16.5 µg/m³, month before 12.6 µg/m³
  • O₃: average 49.5 µg/m³, month before 85.9 µg/m³

Show

Ozone O₃

12.4

Nowµg/m³

Measured at 00:00

32.1

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

34.9

Last 7 daysµg/m³

measured in 99 % of hours · provisional

39.2

Last 30 daysµg/m³

measured in 98 % of hours · provisional

50.7

Last 12 monthsµg/m³

measured in 94 % of hours · provisional

Days in 2024: O₃, 8-hour average above 120 µg/m³

24 days above the limit. 4 days without any reading from the station.

1102031JanFebMarAprApr 13: 125 µg/m³, above the limitApr 14: 135 µg/m³, above the limitApr 15: 129 µg/m³, above the limitApr 30: 126 µg/m³, above the limitMayMay 10: 122 µg/m³, above the limitMay 11: 132 µg/m³, above the limitMay 12: 121 µg/m³, above the limitJunJun 5: 121 µg/m³, above the limitJun 6: 127 µg/m³, above the limitJun 7: 137 µg/m³, above the limitJun 17: 123 µg/m³, above the limitJun 18: 121 µg/m³, above the limitJulJul 11: 125 µg/m³, above the limitJul 15: 145 µg/m³, above the limitJul 16: 147 µg/m³, above the limitJul 19: 128 µg/m³, above the limitJul 27: 138 µg/m³, above the limitJul 28: 123 µg/m³, above the limitAugAug 14: 123 µg/m³, above the limitAug 23: 126 µg/m³, above the limitAug 24: 132 µg/m³, above the limitAug 30: 121 µg/m³, above the limitAug 31: 129 µg/m³, above the limitSepSep 1: 135 µg/m³, above the limitSep 19: no data from the stationSep 20: no data from the stationSep 21: no data from the stationSep 22: no data from the stationOctNovDec
  • 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 (24)
  1. Apr 13 125
  2. Apr 14 135
  3. Apr 15 129
  4. Apr 30 126
  5. May 10 122
  6. May 11 132
  7. May 12 121
  8. Jun 5 121
  9. Jun 6 127
  10. Jun 7 137
  11. Jun 17 123
  12. Jun 18 121
  13. Jul 11 125
  14. Jul 15 145
  15. Jul 16 147
  16. Jul 19 128
  17. Jul 27 138
  18. Jul 28 123
  19. Aug 14 123
  20. Aug 23 126
  21. Aug 24 132
  22. Aug 30 121
  23. Aug 31 129
  24. Sep 1 135

Values in µg/m³, limit 120 µg/m³.

Months of 2024

MonthDays above 120Highest 8 hNo readings
January0690
February0800
March01110
April4 above the number allowed1350
May3 above the number allowed1320
June5 above the number allowed1370
July6 above the number allowed1470
August5 above the number allowed1320
September1 above the number allowed1354
October0730
November0610
December0600

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 123 µg/m³, latest 6 µg/m³ (23:00)050100150ThuFriSatSunMonTueWedhighest 123latest 6 (23:00)
measuredmodel estimate, not counted
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
00:0042model estimate, not counted
23:005.5
22:007.2
21:0047.6
20:0034.7
19:0053.8
18:0074.6
17:0089.2
16:0092
15:00100.3
14:0053.6
13:0032
12:0028.2
11:0018.3
10:005.9
09:004
08:003.3
07:002.7
06:004.2
05:009.5
04:0018
03:0014
02:007.2
01:002.9
Tuesday, 10/6
00:003
23:003.2
22:003.4
21:003.6
20:008.9
19:0010.7
18:0048.2
17:0080
16:0077.6
15:0056.5
14:0026.1
13:0019.3
12:0020.5
11:0012.6
10:007.7
09:004.9
08:003.4
07:006.2
06:004.2
05:003.4
04:004
03:008.5
02:0013.7
01:0013.4
Monday, 10/5
00:0018.4
23:006.7
22:003.2
21:003.2
20:004.2
19:0036.5
18:0064.6
17:0076.7
16:0080.6
15:0078.8
14:0056.3
13:0040
12:0020.4
11:0020.1
10:008.1
09:005.1
08:002.8
07:003.6
06:005
05:0012.3
04:0013.8
03:008.1
02:0023.3
01:0039.7
Sunday, 10/4
00:0031.1
23:0027.5
22:0020.4
21:007.1
20:0027.3
19:0070.8
18:00111.6
17:00114.3
16:00112.6
15:00111.1
14:0099.7
13:0075.1
12:0052.5
11:0036.3
10:0018.4
09:0015.5
08:0013.6
07:0016.4
06:0023.2
05:0022.5
04:0019.1
03:0030
02:0021.8
01:007.5
Saturday, 10/3
00:0021.4
23:0018.6
22:0028.5
21:0015.9
20:0015.7
19:0088.1
18:00112.2
17:00118.4
16:00122.7
15:00118.5
14:0098.8
13:0069.4
12:0044.6
11:0033.6
10:0016.1
09:008.4
08:003.9
07:007
06:0020.3
05:0016
04:0022.7
03:0024.2
02:0027.8
01:0020.7
Friday, 10/2
00:006.6
23:0019.9
22:0036.3
21:0016.5
20:009.3
19:0064.1
18:0095.9
17:00104.2
16:00102.6
15:0099.2
14:0087.8
13:0063
12:0040.7
11:0021.9
10:009.1
09:004.5
08:003.7
07:005.9
06:0019.7
05:0022.8
04:0025
03:0033.1
02:0026.3
01:0022.5
Thursday, 10/1
00:0014.9
23:0035.8
22:007.2
21:0036.5
20:0060
19:0071
18:0095.2
17:0097.7
16:0098.3
15:0098.2
14:0084
13:0061.8
12:0034.4
11:0017.8
10:007.3
09:005.5
08:003
07:002.7
06:005.3
05:008.4
04:0023.6
03:0020.1
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 1 day above the limithighest 125 µg/m³, latest 68 µg/m³0501001509/109/179/2410/1highest 125latest 68
day above the limittoo few readingstarget value, 120 µg/m³
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 1 day above the limit
Values as a table
Dayµg/m³Note
Wed, 10/768.2provisional
Tue, 10/642.6provisional
Mon, 10/556.7provisional
Sun, 10/493.4provisional
Sat, 10/396.6provisional
Fri, 10/282.2provisional
Thu, 10/183.3provisional
Wed, 9/3081.5provisional
Tue, 9/2992.1provisional
Mon, 9/2877.3provisional
Sun, 9/2786.9provisional
Sat, 9/2683.1provisional
Fri, 9/2574.7provisional
Thu, 9/2450.7provisional
Wed, 9/2376.3provisional
Tue, 9/2269.6provisional
Mon, 9/2162.2provisional
Sun, 9/2078provisional
Sat, 9/1978.2provisional
Fri, 9/1856.3provisional
Thu, 9/1788.7provisional
Wed, 9/1692.8provisional
Tue, 9/1574.6provisional
Mon, 9/1478.2provisional
Sun, 9/1384provisional
Sat, 9/1279.3provisional
Fri, 9/11too few readings
Thu, 9/1056.5provisional
Wed, 9/992.9provisional
Tue, 9/8125.2above the limit · provisional
Last 12 months, monthly average: O₃ in µg/m³highest 86 µg/m³, latest 35 µg/m³050100DecFebAprJunAugOcthighest 86latest 35
Last 12 monthsthis month so fara year earlier
Last 12 months, monthly average: O₃ in µg/m³
Values as a table
Monthµg/m³a year earlierNote
October 2026 so far34.937measured in 99 % of hours · provisional · year before: same days
September 202649.535.8measured in 98 % of hours · provisional
August 202685.957.2measured in 99 % of hours · provisional
July 202682.366.4measured in 100 % of hours · provisional
June 202668.186.9measured in 89 % of hours · provisional
May 202672.366.1measured in 97 % of hours · provisional
April 202670.263.3measured in 98 % of hours · provisional
March 202655.649.2measured in 97 % of hours · provisional
February 202623.433.8measured in 94 % of hours · provisional
January 202624.331.2measured in 100 % of hours · provisional
December 20259.113.8measured in 95 % of hours · verified
November 202528.219measured in 76 % 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)5124≥ 24²
Annual average, µg/m³58.8*4746.3¹
Highest 8-hour average, µg/m³160August 16161June 26147July 16
Hours measured97 %93 %89 %
Days without any reading from the station004

* 2026 up to October 7; the average since the start of the year is not yet an annual average.

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

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

¹ Fewer than 90 % of the hours were measured, so we do not compare this average with the limit.

² Too few readings to compare with the number allowed: the figure covers only what was measured.

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

The column for 2023 is shown on wider screens.

The worst days of 2024

DayHighest 8 hTimes the limit
Jul 16, 20241471.2 ×
Jul 15, 20241451.2 ×
Jul 27, 20241381.1 ×
Jun 7, 20241371.1 ×
Apr 14, 20241351.1 ×

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

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 8, 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 Slovenian Environment Agency. 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.