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Air at the Valjevo station

Valjevo, Serbia

Network: Agency for Environmental Protection · Station code: RS0041A

This year, up to yesterday (October 6)

No exceedance on the measured days. 188 of 279 days were measured.

Daily average for 188 of 279 days · data for 2026 not yet finally verified · Yardstick: EU limits (Directive 2008/50/EC)

Poor

Air now · Measured at 21:00

Latest values

Latest value: 21:00

Readings
PollutantValueLevel
NO₂79.8 µg/m³Poor
SO₂8.2 µg/m³Good

How the air is changing

Over the last seven days there was more NO₂ in the air than the week before.

  • NO₂: average 27.4 µg/m³, week before 23.3 µg/m³
  • SO₂: average 7.5 µg/m³, week before 8.4 µg/m³

Last month there was less SO₂ in the air than the month before.

  • NO₂: average 25.2 µg/m³, month before 27.1 µg/m³
  • SO₂: average 9 µg/m³, month before 11.7 µg/m³

Show

Nitrogen dioxide NO₂

79.8

Nowµg/m³

Measured at 21:00

32.3

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

27.4

Last 7 daysµg/m³

measured in 99 % of hours · provisional

25.7

Last 30 daysµg/m³

measured in 98 % of hours · provisional

too few readings

Last 12 months

measured in 73 % of hours · provisional

Days in 2024: NO₂, at least one hour above 200 µg/m³

No measured day above the limit. 1 day without any reading from the station.

1102031JanFebMarAprMayJunJulAugSepOctNovDecDec 17: no data from the station
  • above the limit
  • below the limit
  • too few readings for the day
  • no data from the station

Months of 2024

MonthDays with an hour above 200Hours above 200Highest dayNo readings
January00680
February00560
March00420
April00430
May00360
June00320
July00280
August00360
September00420
October00450
November00530
December00571

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: NO₂ in µg/m³highest 91 µg/m³, latest 80 µg/m³ (21:00)0100200300ThuFriSatSunMonTueWedhighest 91latest 80 (21:00)
measuredmodel estimate, not countedEU hourly limit, 200 µg/m³
Last 7 days, every hour: NO₂ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
21:0079.8
20:0059.6
19:0061.9
18:0025.5
17:0023
16:0014
15:0017.1
14:0010.8
13:007model estimate, not counted
12:0047.3
11:0046
10:0039.1
09:0041.1
08:0043.5
07:0029.2
06:0012.3
05:008.1
04:007.1
03:0011.6
02:0016.4
01:0028
Tuesday, 10/6
00:0041
23:0047.5
22:0061.9
21:0091
20:0072.7
19:0053.7
18:0024
17:0020
16:0018.7
15:0019.6
14:0015.7
13:0023.5
12:0032.7
11:0035.6
10:0047.3
09:0044
08:0045.5
07:0035.8
06:0014.5
05:0010.9
04:008.5
03:0010.5
02:0014.9
01:0024.7
Monday, 10/5
00:0034.6
23:0044.2
22:0060.4
21:0075.5
20:0051.7
19:0064.3
18:0015.7
17:0018.6
16:0013.6
15:008.1
14:0015.2
13:0018.8
12:0029.2
11:0031.5
10:0030.1
09:0039.7
08:0042.5
07:0026.6
06:0010.1
05:006.4
04:0010.1
03:0011.5
02:0016.3
01:0021.4
Sunday, 10/4
00:0032.3
23:0038.9
22:0055.8
21:0067.2
20:0063.7
19:0037
18:0016.3
17:0012.4
16:0011.2
15:006.3
14:007.6
13:0010.7
11:0017.8
10:0018.8
09:0021.4
08:0018.4
07:0011.4
06:0012.6
05:0011.7
04:0017.8
03:0018.8
02:0018.2
01:0029.9
Saturday, 10/3
00:0033.4
23:0042.8
22:0060.3
21:0036.1
20:0080.5
19:0021.9
18:0013.2
17:0010.2
16:0013.5
15:008.6
14:007.7
13:0015.9
12:0029.6
11:0029.2
10:0030.4
09:0031.7
08:0030.5
07:0024.8
06:0013.5
05:0012.6
04:0014.2
03:0015
02:0020.9
01:0028.7
Friday, 10/2
00:0037.2
23:0045.3
22:0064.6
21:0046.8
20:0066.9
19:0024.7
18:0019.5
17:0017.5
16:0013.5
15:0014.7
14:009.4
13:0015.7
12:0022.7
11:0036
10:0030
09:0034.9
08:0032.7
07:0020.8
06:0015
05:0011.1
04:008.9
03:0013.1
02:0021.3
01:0029.2
Thursday, 10/1
00:0036.6
23:0050.4
22:0059.9
21:0063.2
20:0063.5
19:0028.7
18:0014.2
17:0010.7
16:0014
15:009.3
14:008.1
13:0010.6
12:0020.9
10:0031.4
09:0029.6
08:0033.1
07:0017.1
06:0011.5
05:0010.2
04:0010.5
03:0011.4
02:0018.2
01:0028.6
Wednesday, 9/30
00:0042.7
Last 30 days, daily average: NO₂ in µg/m³highest 34 µg/m³, latest 34 µg/m³020409/99/169/239/30highest 34
too few readings
Last 30 days, daily average: NO₂ in µg/m³
Values as a table
Dayµg/m³Note
Tue, 10/633.9provisional
Mon, 10/529provisional
Sun, 10/424.2provisional
Sat, 10/326provisional
Fri, 10/227.2provisional
Thu, 10/125.7provisional
Wed, 9/3025.2provisional
Tue, 9/2926.7provisional
Mon, 9/2826.8provisional
Sun, 9/2717.8provisional
Sat, 9/2616.9provisional
Fri, 9/2524provisional
Thu, 9/2424.9provisional
Wed, 9/2326.1provisional
Tue, 9/2220.9provisional
Mon, 9/2132.1provisional
Sun, 9/2022.2provisional
Sat, 9/1926.5provisional
Fri, 9/18too few readings
Thu, 9/1727.8provisional
Wed, 9/1624.9provisional
Tue, 9/1521.8provisional
Mon, 9/1430.9provisional
Sun, 9/1321.9provisional
Sat, 9/1220.6provisional
Fri, 9/1128.6provisional
Thu, 9/1028.1provisional
Wed, 9/931provisional
Tue, 9/827.2provisional
Mon, 9/726.3provisional
Last 12 months, monthly average: NO₂ in µg/m³highest 32 µg/m³, latest 28 µg/m³0204060DecFebAprJunAugOcthighest 32latest 28
Last 12 monthsthis month so fara year earlierEU annual limit, 40 µg/m³month with days without data from the station
Last 12 months, monthly average: NO₂ in µg/m³
Values as a table
Monthµg/m³a year earlierNote
October 2026 so far27.719measured in 99 % of hours · provisional · year before: same days
September 202625.218.2measured in 98 % of hours · provisional
August 202627.120.5measured in 99 % of hours · provisional
July 202625.422.9measured in 98 % of hours · provisional
June 202622.724.1measured in 98 % of hours · provisional
May 202625.123.7measured in 99 % of hours · provisional
April 202627.929.5measured in 98 % of hours · provisional
March 2026too few readings32.131 days without data from the station
February 2026too few readings3728 days without data from the station
January 2026too few readings38.431 days without data from the station
December 20253235.9measured in 92 % of hours · verified · 1 day without data from the station
November 202530.834measured in 99 % of hours · verified

NO₂ by year

Yardstick: EU limits (Directive 2008/50/EC)

Measure2026*20252024
Hours above 200 µg/m³ (allowed 18)0²00
Hours above 400 µg/m³, three hours in a row (alert threshold)000
Annual average, µg/m³ (EU limit 40)too few27.930.1
Highest daily average, µg/m³40April 362December 1868January 15
Highest hourly value, µg/m³112August 11149December 18134January 15
Hours measured67 %98 %98 %
Days without any reading from the station9011

* 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.

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.

There is no allowed number for the warning and alert thresholds: every such hour or day is in red.

The column for 2023 is shown on wider screens.

Compared with the new EU rules and the WHO recommendation

This is not the yardstick for the verdict above, only a comparison. From 2030 the EU tightens its limits (Directive (EU) 2024/2881), and since 2021 the World Health Organization has recommended even lower values.

  • EU from 2030: daily 50 µg/m³, 18 days allowed. In 2024 there were 16 such days.
  • WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2024 there were 245 such days.
  • EU from 2030: annual average 20 µg/m³. Average in 2024: 30 µg/m³.
  • WHO 2021: annual average 10 µg/m³. Average in 2024: 30 µg/m³.

Sources: Directive (EU) 2024/2881, Annex I; WHO global air quality guidelines 2021, table 0.1. Checked against the texts on 7 October 2026.

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: 92

2 outages, 2,209 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

FromToDuration
Jan 1, 2026 00:00Apr 1, 2026 01:0090 days
Dec 22, 2025 12:00Dec 24, 2025 13:002 days

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 Agency for Environmental Protection. 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.