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Air at the Nova Gorica station

Nova Gorica, Slovenia

Network: Slovenian Environment Agency · Station code: SI0034A

This year, up to yesterday (October 7)

40 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.

1 day

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: May 26, 2026, O₃ 147 µg/m³ as a daily average, 1.2 times the limit.

Daily average for 259 of 280 days · data for 2026 not yet finally verified · Yardstick: EU limits (Directive 2008/50/EC)

All figures by year and month

Fair

Air now · Measured at 23:00

Latest values

Latest value: Wed 23:00

Readings
PollutantValueLevel
PM1019.1 µg/m³Fair
NO₂22.4 µg/m³Fair
O₃20.8 µg/m³Good

How the air is changing

Over the last seven days there was more PM10, PM2.5, and O₃ in the air than the week before.

  • PM10: average 17 µg/m³, week before 12.4 µg/m³
  • PM2.5: average 9 µg/m³, week before 7.3 µg/m³
  • NO₂: average 28.7 µg/m³, week before 26.7 µg/m³
  • O₃: average 48.8 µg/m³, week before 39.5 µg/m³

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

  • PM10: average 10.5 µg/m³, month before 14.6 µg/m³
  • PM2.5: average 5.5 µg/m³, month before 8.3 µg/m³
  • NO₂: average 21.4 µg/m³, month before 16.5 µg/m³
  • O₃: average 47.9 µg/m³, month before 80.1 µg/m³

Show

Ozone O₃

20.8

Nowµg/m³

Measured at 23:00

38.2

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

48.8

Last 7 daysµg/m³

measured in 99 % of hours · provisional

43.8

Last 30 daysµg/m³

measured in 100 % of hours · provisional

50.4

Last 12 monthsµg/m³

measured in 92 % of hours · provisional

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

38 days above the limit.

1102031JanFebMarAprApr 14: 137 µg/m³, above the limitApr 15: 123 µg/m³, above the limitMayMay 11: 126 µg/m³, above the limitMay 12: 130 µg/m³, above the limitJunJun 6: 127 µg/m³, above the limitJun 7: 134 µg/m³, above the limitJun 8: 132 µg/m³, above the limitJun 17: 123 µg/m³, above the limitJun 18: 125 µg/m³, above the limitJun 22: 120 µg/m³, above the limitJun 28: 149 µg/m³, above the limitJulJul 5: 122 µg/m³, above the limitJul 12: 124 µg/m³, above the limitJul 13: 120 µg/m³, above the limitJul 14: 121 µg/m³, above the limitJul 15: 141 µg/m³, above the limitJul 16: 162 µg/m³, above the limitJul 19: 122 µg/m³, above the limitJul 21: 127 µg/m³, above the limitJul 26: 124 µg/m³, above the limitJul 27: 144 µg/m³, above the limitJul 28: 142 µg/m³, above the limitJul 31: 135 µg/m³, above the limitAugAug 1: 157 µg/m³, above the limitAug 2: 138 µg/m³, above the limitAug 7: 122 µg/m³, above the limitAug 9: 126 µg/m³, above the limitAug 13: 150 µg/m³, above the limitAug 14: 123 µg/m³, above the limitAug 15: 125 µg/m³, above the limitAug 16: 122 µg/m³, above the limitAug 17: 125 µg/m³, above the limitAug 23: 135 µg/m³, above the limitAug 24: 135 µg/m³, above the limitAug 25: 129 µg/m³, above the limitAug 31: 125 µg/m³, above the limitSepSep 1: 128 µg/m³, above the limitSep 4: 130 µg/m³, above the limitOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
Days above the limit with values (38)
  1. Apr 14 137
  2. Apr 15 123
  3. May 11 126
  4. May 12 130
  5. Jun 6 127
  6. Jun 7 134
  7. Jun 8 132
  8. Jun 17 123
  9. Jun 18 125
  10. Jun 22 120
  11. Jun 28 149
  12. Jul 5 122
  13. Jul 12 124
  14. Jul 13 120
  15. Jul 14 121
  16. Jul 15 141
  17. Jul 16 162
  18. Jul 19 122
  19. Jul 21 127
  20. Jul 26 124
  21. Jul 27 144
  22. Jul 28 142
  23. Jul 31 135
  24. Aug 1 157
  25. Aug 2 138
  26. Aug 7 122
  27. Aug 9 126
  28. Aug 13 150
  29. Aug 14 123
  30. Aug 15 125
  31. Aug 16 122
  32. Aug 17 125
  33. Aug 23 135
  34. Aug 24 135
  35. Aug 25 129
  36. Aug 31 125
  37. Sep 1 128
  38. Sep 4 130

Values in µg/m³, limit 120 µg/m³.

Months of 2024

MonthDays above 120Highest 8 hNo readings
January0740
February0880
March01100
April2 above the number allowed1370
May2 above the number allowed1300
June7 above the number allowed1490
July12 above the number allowed1620
August13 above the number allowed1570
September2 above the number allowed1300
October0740
November0700
December0780

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 121 µg/m³, latest 24 µg/m³ (22:00)050100150ThuFriSatSunMonTueWedlatest 24 (22:00)
measuredmodel estimate, not counted
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
23:0058model estimate, not counted
22:0023.5
21:0034.9
20:0021.4
19:0017.9
18:0027.9
17:0071.3
16:0094.8
15:0063.9
14:0081
13:0088.2
12:0054
11:0041.6
10:0018
09:003.7
08:005.2
07:000.4
06:0014.2
05:0019.8
04:0040.3
03:0041
02:0042.3
01:0035.3
Tuesday, 10/6
00:0045
23:0041.2
22:0030.3
21:0019.8
20:0019.4
19:0090.8
18:00120.7
17:00118.7
16:00114.6
15:00101.2
14:0093
13:0082.6
12:0066.8
11:0024.3
10:009.6
09:001.6
08:001.1
07:006.1
06:0022.4
05:0046.4
04:0047.1
03:0047.6
02:0051.3
01:0043.7
Monday, 10/5
00:0037.3
23:0032.7
22:0023.2
21:0013.8
20:0014.3
19:0020.4
18:0083.5
17:0081.9
16:0084.3
15:0090.8
14:0079.1
13:0065.2
12:0038.7
11:0019.3
10:007.3
09:003.6
08:000.9
07:007.3
06:0023
05:0035
04:0042.3
03:0042.4
02:0043.2
01:0037
Sunday, 10/4
00:0042.6
23:0039
22:0025
21:0025.2
20:0027.5
19:0055
18:00105.3
17:00108
16:00101
15:00102.6
14:00102.4
13:0096.1
12:0078.7
11:0061.8
10:0047.2
09:0037.2
08:0037.3
07:0035.9
06:0045.8
05:0048.9
04:0048.2
03:0058.5
02:0050.3
01:0042.7
Saturday, 10/3
00:0033.8
23:0033.4
22:0015.8
21:0014.7
20:0013.5
19:0012.9
18:0074.5
17:0095.8
16:00100.6
15:0097.9
14:0096.6
13:0097.3
12:0098.9
11:0097.4
10:0053.8
09:0026.5
08:0041.4
07:0034.3
06:0052.9
05:0061.8
04:0055.2
03:0052.6
02:0043.6
01:0042.6
Friday, 10/2
00:0037.8
23:0038
22:0027.9
21:0026
20:0024.3
19:0024.5
18:0041.2
17:0079.2
16:0079.8
15:0083.8
14:0096.1
13:0092.4
12:0086.6
11:0068.8
10:0023.1
09:0011.5
08:002.4
07:006.2
06:0023.3
05:0042.8
04:0055.4
03:0059.7
02:0060.8
01:0047.2
Thursday, 10/1
00:0042.6
23:0033.4
22:0021.6
21:0010.4
20:0014.4
19:0030.9
18:0073.2
17:0081.5
16:0088.1
15:0088.9
14:0092
13:0092.8
12:0088.8
11:0080.2
10:0042.6
09:0011.1
08:005.8
07:007.3
06:0029.7
05:0047.7
04:0062.4
03:0060.9
02:0047.9
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 1 day above the limithighest 122 µg/m³, latest 65 µg/m³0501001509/109/179/2410/1highest 122latest 65
day above the limittarget 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, 10/765.3provisional
Tue, 10/698.5provisional
Mon, 10/568provisional
Sun, 10/494.5provisional
Sat, 10/394.9provisional
Fri, 10/278.5provisional
Thu, 10/185.7provisional
Wed, 9/3060.4provisional
Tue, 9/2989.5provisional
Mon, 9/2875.8provisional
Sun, 9/2774provisional
Sat, 9/2673.8provisional
Fri, 9/2570.3provisional
Thu, 9/2458.7provisional
Wed, 9/2369.5provisional
Tue, 9/2271.2provisional
Mon, 9/2142.5provisional
Sun, 9/2074.5provisional
Sat, 9/1969.6provisional
Fri, 9/1870.3provisional
Thu, 9/1749.4provisional
Wed, 9/1690provisional
Tue, 9/1565.9provisional
Mon, 9/1494provisional
Sun, 9/1386.2provisional
Sat, 9/1271.4provisional
Fri, 9/1151.1provisional
Thu, 9/1049.1provisional
Wed, 9/981.2provisional
Tue, 9/8122.3above the limit · provisional
Last 12 months, monthly average: O₃ in µg/m³highest 80 µg/m³, latest 49 µg/m³050100150DecFebAprJunAugOcthighest 80latest 49
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 far48.838.9measured in 99 % of hours · provisional · year before: same days
September 202647.943.9measured in 98 % of hours · provisional
August 202680.170.9measured in 93 % of hours · provisional
July 202676.472.8measured in 99 % of hours · provisional
June 20266890.9measured in 95 % of hours · provisional
May 202665.768.7measured in 95 % of hours · provisional
April 202665.562.2measured in 98 % of hours · provisional
March 202650.654.3measured in 94 % of hours · provisional
February 202626.937.9measured in 85 % of hours · provisional
January 202628.527.9measured in 81 % of hours · provisional
December 2025too few readings23.2measured in 72 % of hours · verified
November 202526.923.5measured in 94 % 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)404238
Annual average, µg/m³57.5*51.347.4
Highest 8-hour average, µg/m³147May 26170June 19162July 16
Hours measured93 %94 %94 %
Days without any reading from the station000

* 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.

■ 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, 20241621.4 ×
Aug 1, 20241571.3 ×
Aug 13, 20241501.2 ×
Jun 28, 20241491.2 ×
Jul 27, 20241441.2 ×

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 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.