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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 6)

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

All figures by year and month

Good

Air now · Measured at 21:00

Latest values

Latest value: 21:00

Readings
PollutantValueLevel
PM10Model estimate, not a measurement32 µg/m³no level
NO₂Model estimate, not a measurement19 µg/m³no level
O₃23.9 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 27.3 µg/m³, week before 16.6 µg/m³
  • PM2.5: average 15 µg/m³, week before 10 µg/m³
  • NO₂: average 27.8 µg/m³, week before 18.7 µg/m³
  • O₃: average 35.7 µg/m³, week before 37.2 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

23.9

Nowµg/m³

Measured at 21:00

29.1

Last 24 hoursµg/m³

measured in 96 % of hours · provisional

35.7

Last 7 daysµg/m³

measured in 100 % of hours · provisional

40.6

Last 30 daysµg/m³

measured in 98 % of hours · provisional

50.8

Last 12 monthsµg/m³

measured in 94 % of hours · provisional

Days in 2023: O₃, 8-hour average above 120 µg/m³

22 days above the limit.

1102031JanFebMarAprMayJunJun 17: 130 µg/m³, above the limitJun 18: 147 µg/m³, above the limitJun 19: 139 µg/m³, above the limitJun 20: 141 µg/m³, above the limitJun 21: 140 µg/m³, above the limitJun 22: 151 µg/m³, above the limitJun 23: 127 µg/m³, above the limitJun 29: 124 µg/m³, above the limitJun 30: 133 µg/m³, above the limitJulJul 8: 122 µg/m³, above the limitJul 9: 121 µg/m³, above the limitJul 10: 131 µg/m³, above the limitJul 11: 160 µg/m³, above the limitJul 12: 147 µg/m³, above the limitJul 15: 127 µg/m³, above the limitJul 29: 127 µg/m³, above the limitJul 30: 125 µg/m³, above the limitAugAug 25: 131 µg/m³, above the limitAug 26: 129 µg/m³, above the limitAug 27: 122 µg/m³, above the limitSepSep 12: 125 µg/m³, above the limitSep 13: 123 µg/m³, above the limitOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
Days above the limit with values (22)
  1. Jun 17 130
  2. Jun 18 147
  3. Jun 19 139
  4. Jun 20 141
  5. Jun 21 140
  6. Jun 22 151
  7. Jun 23 127
  8. Jun 29 124
  9. Jun 30 133
  10. Jul 8 122
  11. Jul 9 121
  12. Jul 10 131
  13. Jul 11 160
  14. Jul 12 147
  15. Jul 15 127
  16. Jul 29 127
  17. Jul 30 125
  18. Aug 25 131
  19. Aug 26 129
  20. Aug 27 122
  21. Sep 12 125
  22. Sep 13 123

Values in µg/m³, limit 120 µg/m³.

Months of 2023

MonthDays above 120Highest 8 hNo readings
January0600
February0980
March01160
April01200
May01180
June9 above the number allowed1510
July8 above the number allowed1600
August3 above the number allowed1310
September2 above the number allowed1250
October01120
November0750
December0710

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 46 µg/m³ (20:00)050100150ThuFriSatSunMonTueWedhighest 123latest 46 (20:00)
measured
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
20:0045.5
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
02:0025.1
01:0025.6
Wednesday, 9/30
00:0012.4
23:0020.8
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 2 days above the limithighest 126 µg/m³, latest 43 µg/m³0501001509/99/169/239/30highest 126latest 43
day above the limittoo few readingstarget value, 120 µg/m³
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 2 days above the limit
Values as a table
Dayµg/m³Note
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
Mon, 9/7125.9above the limit · provisional
Last 12 months, monthly average: O₃ in µg/m³highest 86 µg/m³, latest 36 µg/m³050100DecFebAprJunAugOcthighest 86latest 36
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 far35.537.8measured in 100 % 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/m³58.9*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 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.

The column for 2023 is shown on wider screens.

The worst days of 2023

DayHighest 8 hTimes the limit
Jul 11, 20231601.3 ×
Jun 22, 20231511.3 ×
Jul 12, 20231471.2 ×
Jun 18, 20231471.2 ×
Jun 20, 20231411.2 ×

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: 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 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.