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Air at the Zagorje station

Zagorje ob Savi, Slovenia

Network: Slovenian Environment Agency · Station code: SI0036A

This year, up to yesterday (October 7)

29 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.

4 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: September 4, 2026, O₃ 155 µg/m³ as a daily average, 1.3 times the limit.

Daily average for 260 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 00:00

Latest values

Latest value: 00:00

Readings
PollutantValueLevel
PM1018.5 µg/m³Fair
NO₂13.9 µg/m³Fair
O₃14.1 µg/m³Good
SO₂2 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 19.8 µg/m³, week before 12.9 µg/m³
  • PM2.5: average 11.6 µg/m³, week before 8 µg/m³
  • NO₂: average 16.8 µg/m³, week before 11.3 µg/m³
  • O₃: average 34.9 µg/m³, week before 33.8 µg/m³
  • SO₂: too few readings to compare

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

  • PM10: average 10.9 µg/m³, month before 14.1 µg/m³
  • PM2.5: average 5.3 µg/m³, month before 7.2 µg/m³
  • NO₂: average 9.8 µg/m³, month before 10.1 µg/m³
  • O₃: average 43.3 µg/m³, month before 76.5 µg/m³
  • SO₂: too few readings to compare

Show

Ozone O₃

14.1

Nowµg/m³

Measured at 00:00

40.9

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

34.9

Last 7 daysµg/m³

measured in 99 % of hours · provisional

34.9

Last 30 daysµg/m³

measured in 100 % of hours · provisional

45.8

Last 12 monthsµg/m³

measured in 91 % of hours · provisional

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

5 days above the limit.

1102031JanFebMarAprApr 14: 123 µg/m³, above the limitApr 15: 124 µg/m³, above the limitMayMay 11: 125 µg/m³, above the limitJunJulJul 11: 127 µg/m³, above the limitJul 16: 129 µg/m³, above the limitAugSepOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
Days above the limit with values (5)
  1. Apr 14 123
  2. Apr 15 124
  3. May 11 125
  4. Jul 11 127
  5. Jul 16 129

Values in µg/m³, limit 120 µg/m³.

Months of 2024

MonthDays above 120Highest 8 hNo readings
January0610
February0860
March01020
April2 above the number allowed1240
May1 above the number allowed1250
June01150
July2 above the number allowed1290
August01170
September01110
October0750
November0660
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 15 µg/m³ (23:00)050100150ThuFriSatSunMonTueWedhighest 123latest 15 (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
00:0061model estimate, not counted
23:0015.3
22:0026.3
21:0031.7
20:0052.9
19:0064.4
18:0077.1
17:0086.3
16:0088.5
15:0091.1
14:0089
13:0092.4
12:0082.1
11:0056.4
10:0013.5
09:001.8
08:000.7
07:000.4
06:000.9
05:002.2
04:007.8
03:0010.1
02:009.9
01:0011.6
Tuesday, 10/6
00:006.4
23:003.2
22:005.4
21:006.7
20:0021
19:0035.6
18:0069.6
17:0078
16:0091.1
15:0099.9
14:0091.4
13:0049.4
12:0047
11:0024.9
10:006.1
09:003.7
08:001.8
07:003.1
06:005.9
05:006.2
04:001.5
03:001.6
02:002.6
01:002.8
Monday, 10/5
00:001.4
23:004.3
22:003.8
21:006.8
20:0019.8
19:0028.5
18:0048.1
17:0072.5
16:0085.7
15:0073.3
14:0062.5
13:0054.9
12:0040.7
11:0028.8
10:0012.4
09:002.6
08:000.5
07:000
06:001.1
05:004.1
04:006.7
03:007.7
02:0010.4
01:0010.1
Sunday, 10/4
00:008.7
23:0012.6
22:0011.9
21:0021.2
20:0023.6
19:0033.2
18:0044.7
17:0076.3
16:00103.2
15:00105.6
14:00107.6
13:0085.9
12:0064.4
11:0050.2
10:0023
09:0013.8
08:008.1
07:0012.2
06:0015
05:0015.3
04:0018.4
03:0019.4
02:0021.4
01:0022.9
Saturday, 10/3
00:0022.7
23:0020.1
22:0023.1
21:0024.4
20:0030.3
19:0048
18:0062.2
17:00101.1
16:00117.5
15:00122.2
14:00123.4
13:0088.1
12:0064.7
11:0037.5
10:0020.3
09:007
08:003.2
07:004.9
06:009.9
05:0012.4
04:0014.5
03:0016.6
02:0020.6
01:0020.7
Friday, 10/2
00:0020.2
23:0020.8
22:0021.4
21:0022.7
20:0034
19:0031.5
18:0063.3
17:0095.3
16:0094.6
15:0096
14:00101.3
13:0083.9
12:0052.7
11:0027.8
10:0017.7
09:003.4
08:001
07:001.3
06:003.4
05:0010.1
04:0011
03:0012.7
02:0010.3
01:0015.2
Thursday, 10/1
00:0016.4
23:0020
22:0019.3
21:0022.9
20:0024.6
19:0036.1
18:0083
17:0096.9
16:0099.3
15:0098.2
14:0094
13:0089
12:0048
11:0033.7
10:0015.6
09:001.9
08:000.9
07:000.7
06:002.8
05:0010.4
04:0012.5
03:0015
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³highest 102 µg/m³, latest 84 µg/m³0501001509/109/179/2410/1highest 102latest 84
target value, 120 µg/m³
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³
Values as a table
Dayµg/m³Note
Wed, 10/783.8provisional
Tue, 10/670.3provisional
Mon, 10/558.3provisional
Sun, 10/479.7provisional
Sat, 10/390.9provisional
Fri, 10/277.3provisional
Thu, 10/180.5provisional
Wed, 9/3082.1provisional
Tue, 9/2982.3provisional
Mon, 9/2882provisional
Sun, 9/2779.3provisional
Sat, 9/2670.1provisional
Fri, 9/2568.9provisional
Thu, 9/2444.2provisional
Wed, 9/2365.7provisional
Tue, 9/2267provisional
Mon, 9/2159.3provisional
Sun, 9/2062.6provisional
Sat, 9/1974.8provisional
Fri, 9/1844.4provisional
Thu, 9/1739provisional
Wed, 9/1671.5provisional
Tue, 9/1560.4provisional
Mon, 9/1456.9provisional
Sun, 9/1377.3provisional
Sat, 9/1276.8provisional
Fri, 9/1151.6provisional
Thu, 9/1051.2provisional
Wed, 9/982.7provisional
Tue, 9/8101.9provisional
Last 12 months, monthly average: O₃ in µg/m³highest 77 µg/m³, latest 35 µg/m³050100DecFebAprJunAugOcthighest 77latest 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 far34.930.7measured in 99 % of hours · provisional · year before: same days
September 202643.328.7measured in 100 % of hours · provisional
August 202676.553measured in 100 % of hours · provisional
July 202669.459.3measured in 97 % of hours · provisional
June 202655.474.8measured in 97 % of hours · provisional
May 202661.958.4measured in 97 % of hours · provisional
April 202660.153.1measured in 99 % of hours · provisional
March 20264642.7measured in 85 % of hours · provisional
February 202623.732.5measured in 85 % of hours · provisional
January 202629.532.5measured in 92 % of hours · provisional
December 202510.619.2measured in 78 % of hours · verified
November 202528.823.8measured in 81 % 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)29≥ 18²5
Annual average, µg/m³52.3*42.541.7
Highest 8-hour average, µg/m³155September 4160June 23129July 16
Hours measured95 %91 %92 %
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.

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

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, 20241291.1 ×
Jul 11, 20241271.1 ×
May 11, 20241251.0 ×
Apr 15, 20241241.0 ×
Apr 14, 20241231.0 ×

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.