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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 20:00

Latest values

Latest value: 20:00

Readings
PollutantValueLevel
PM10Model estimate, not a measurement25 µg/m³no level
NO₂Model estimate, not a measurement11 µg/m³no level
O₃15.6 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

15.6

Nowµg/m³

Measured at 20:00

38.9

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

37 days above the limit.

1102031JanFebMarMar 22: 124 µg/m³, above the limitAprApr 7: 125 µg/m³, above the limitApr 8: 123 µg/m³, above the limitApr 22: 126 µg/m³, above the limitApr 23: 124 µg/m³, above the limitApr 27: 124 µg/m³, above the limitApr 29: 131 µg/m³, above the limitMayMay 5: 138 µg/m³, above the limitMay 6: 143 µg/m³, above the limitMay 7: 139 µg/m³, above the limitMay 23: 125 µg/m³, above the limitJunJun 9: 130 µg/m³, above the limitJun 17: 147 µg/m³, above the limitJun 18: 148 µg/m³, above the limitJun 19: 151 µg/m³, above the limitJun 20: 144 µg/m³, above the limitJun 21: 168 µg/m³, above the limitJun 22: 178 µg/m³, above the limitJun 23: 122 µg/m³, above the limitJun 26: 143 µg/m³, above the limitJun 29: 131 µg/m³, above the limitJun 30: 132 µg/m³, above the limitJulJul 8: 139 µg/m³, above the limitJul 9: 151 µg/m³, above the limitJul 10: 165 µg/m³, above the limitJul 11: 169 µg/m³, above the limitJul 15: 151 µg/m³, above the limitJul 16: 135 µg/m³, above the limitJul 17: 127 µg/m³, above the limitJul 28: 123 µg/m³, above the limitJul 29: 135 µg/m³, above the limitAugAug 22: 131 µg/m³, above the limitAug 25: 133 µg/m³, above the limitAug 26: 131 µg/m³, above the limitSepSep 2: 121 µg/m³, above the limitSep 11: 122 µg/m³, above the limitSep 12: 131 µg/m³, above the limitOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
  • no O₃ data in the EEA database
Days above the limit with values (37)
  1. Mar 22 124
  2. Apr 7 125
  3. Apr 8 123
  4. Apr 22 126
  5. Apr 23 124
  6. Apr 27 124
  7. Apr 29 131
  8. May 5 138
  9. May 6 143
  10. May 7 139
  11. May 23 125
  12. Jun 9 130
  13. Jun 17 147
  14. Jun 18 148
  15. Jun 19 151
  16. Jun 20 144
  17. Jun 21 168
  18. Jun 22 178
  19. Jun 23 122
  20. Jun 26 143
  21. Jun 29 131
  22. Jun 30 132
  23. Jul 8 139
  24. Jul 9 151
  25. Jul 10 165
  26. Jul 11 169
  27. Jul 15 151
  28. Jul 16 135
  29. Jul 17 127
  30. Jul 28 123
  31. Jul 29 135
  32. Aug 22 131
  33. Aug 25 133
  34. Aug 26 131
  35. Sep 2 121
  36. Sep 11 122
  37. Sep 12 131

Values in µg/m³, limit 120 µg/m³.

Months of 2023

MonthDays above 120Highest 8 hNo readings
January0800
February01030
March1 above the number allowed1240
April6 above the number allowed1310
May4 above the number allowed1430
June11 above the number allowed1780
July9 above the number allowed1690
August3 above the number allowed1330
September3 above the number allowed1310
October01170
November0760
December0730

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 (19:00)050100150ThuFriSatSunMonTueWedlatest 16 (19:00)
measured
Last 7 days, every hour: O₃ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
19:0015.6
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
22:0011.2
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 2023

DayHighest 8 hTimes the limit
Jun 22, 20231781.5 ×
Jul 11, 20231691.4 ×
Jun 21, 20231681.4 ×
Jul 10, 20231651.4 ×
Jul 15, 20231511.3 ×

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.