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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 6)

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 258 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 measurement28 µg/m³no level
NO₂Model estimate, not a measurement10 µg/m³no level
O₃27.8 µg/m³Good

How the air is changing

Over the last seven days there was more PM10, PM2.5, NO₂, and O₃ in the air than the week before.

  • PM10: average 16.4 µg/m³, week before 11.2 µg/m³
  • PM2.5: average 9.1 µg/m³, week before 6.6 µg/m³
  • NO₂: average 28.9 µg/m³, week before 24.9 µg/m³
  • O₃: average 48.1 µg/m³, week before 40.2 µg/m³

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

  • PM10: average 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

27.8

Nowµg/m³

Measured at 21:00

38.8

Last 24 hoursµg/m³

measured in 96 % of hours · provisional

48.1

Last 7 daysµg/m³

measured in 100 % of hours · provisional

44.7

Last 30 daysµg/m³

measured in 100 % of hours · provisional

50.4

Last 12 monthsµg/m³

measured in 92 % of hours · provisional

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

42 days above the limit.

1102031JanFebMarAprApr 5: 126 µg/m³, above the limitApr 11: 126 µg/m³, above the limitApr 12: 121 µg/m³, above the limitMayMay 1: 137 µg/m³, above the limitMay 2: 149 µg/m³, above the limitMay 3: 141 µg/m³, above the limitMay 14: 120 µg/m³, above the limitMay 26: 139 µg/m³, above the limitMay 31: 143 µg/m³, above the limitJunJun 1: 138 µg/m³, above the limitJun 10: 122 µg/m³, above the limitJun 11: 140 µg/m³, above the limitJun 12: 141 µg/m³, above the limitJun 13: 127 µg/m³, above the limitJun 14: 153 µg/m³, above the limitJun 15: 166 µg/m³, above the limitJun 16: 132 µg/m³, above the limitJun 18: 125 µg/m³, above the limitJun 19: 170 µg/m³, above the limitJun 20: 152 µg/m³, above the limitJun 21: 123 µg/m³, above the limitJun 22: 158 µg/m³, above the limitJun 23: 161 µg/m³, above the limitJun 24: 136 µg/m³, above the limitJun 25: 156 µg/m³, above the limitJun 26: 163 µg/m³, above the limitJun 28: 142 µg/m³, above the limitJun 29: 131 µg/m³, above the limitJun 30: 133 µg/m³, above the limitJulJul 1: 128 µg/m³, above the limitJul 2: 128 µg/m³, above the limitJul 3: 151 µg/m³, above the limitJul 4: 133 µg/m³, above the limitJul 6: 137 µg/m³, above the limitJul 14: 129 µg/m³, above the limitJul 15: 128 µg/m³, above the limitJul 19: 127 µg/m³, above the limitJul 20: 126 µg/m³, above the limitAugAug 14: 129 µg/m³, above the limitAug 15: 130 µg/m³, above the limitAug 16: 128 µg/m³, above the limitAug 19: 129 µg/m³, above the limitSepOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
Days above the limit with values (42)
  1. Apr 5 126
  2. Apr 11 126
  3. Apr 12 121
  4. May 1 137
  5. May 2 149
  6. May 3 141
  7. May 14 120
  8. May 26 139
  9. May 31 143
  10. Jun 1 138
  11. Jun 10 122
  12. Jun 11 140
  13. Jun 12 141
  14. Jun 13 127
  15. Jun 14 153
  16. Jun 15 166
  17. Jun 16 132
  18. Jun 18 125
  19. Jun 19 170
  20. Jun 20 152
  21. Jun 21 123
  22. Jun 22 158
  23. Jun 23 161
  24. Jun 24 136
  25. Jun 25 156
  26. Jun 26 163
  27. Jun 28 142
  28. Jun 29 131
  29. Jun 30 133
  30. Jul 1 128
  31. Jul 2 128
  32. Jul 3 151
  33. Jul 4 133
  34. Jul 6 137
  35. Jul 14 129
  36. Jul 15 128
  37. Jul 19 127
  38. Jul 20 126
  39. Aug 14 129
  40. Aug 15 130
  41. Aug 16 128
  42. Aug 19 129

Values in µg/m³, limit 120 µg/m³.

Months of 2025

MonthDays above 120Highest 8 hNo readings
January0720
February0870
March01050
April3 above the number allowed1260
May6 above the number allowed1490
June20 above the number allowed1700
July9 above the number allowed1510
August4 above the number allowed1300
September01040
October0760
November0700
December0460

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 16 µg/m³ (20:00)050100150ThuFriSatSunMonTueWedlatest 16 (20:00)
measured
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
20:0015.6
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
01:0032.5
Wednesday, 9/30
00:0026
23:0018
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 1 day above the limithighest 122 µg/m³, latest 99 µg/m³0501001509/99/169/239/30highest 122latest 99
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
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
Mon, 9/7106.8provisional
Last 12 months, monthly average: O₃ in µg/m³highest 80 µg/m³, latest 50 µg/m³050100150DecFebAprJunAugOcthighest 80latest 50
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 far50.540.4measured in 100 % 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/m³57.6*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 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.

The column for 2023 is shown on wider screens.

The worst days of 2025

DayHighest 8 hTimes the limit
Jun 19, 20251701.4 ×
Jun 15, 20251661.4 ×
Jun 26, 20251631.4 ×
Jun 23, 20251611.3 ×
Jun 22, 20251581.3 ×

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.