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Air at the Tuzla1 - MS2 station

Tuzla, Tuzla Canton · Federation of Bosnia and Herzegovina

Network: Federal Hydrometeorological Institute · Station code: BA0032A

This year, up to yesterday (October 6)

at least

22 hours

with sulphur dioxide (SO₂) above the legal hourly limit of 350 µg/m³.

Readings are missing for part of the period, so the real number may be higher.

In 2025: 16 hours above the limit, 24 allowed.

at least

2 days

with a daily average of sulphur dioxide (SO₂) above the legal limit of 125 µg/m³.

Readings are missing for part of the period, so the real number may be higher.

Highest hourly value: January 21, 2026, SO₂ 935 µg/m³, 2.7 times the hourly limit.

SO₂ was above the alert threshold of 500 µg/m³ for at least 9 hours, three or more hours in a row (on 1 day).

These are measured values only. Whether a warning or alert episode has been declared is decided and published by the competent authorities.

Daily average for 235 of 279 days · data for 2026 not yet finally verified · Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)

All figures by year and month

Poor

Air now · Measured at 21:00

Latest values

Latest value: 21:00

Readings
PollutantValueLevel
PM1045.1 µg/m³Moderate
NO₂86.6 µg/m³Poor
SO₂35.4 µg/m³Fair

How the air is changing

Over the last seven days there was more PM10 and NO₂ and less SO₂ in the air than the week before.

  • PM10: average 16.8 µg/m³, week before 13 µg/m³
  • PM2.5: too few readings to compare
  • NO₂: average 28.8 µg/m³, week before 22 µg/m³
  • SO₂: average 17.4 µg/m³, week before 20.4 µg/m³

There are not enough readings to compare with the month before.

  • PM10: too few readings to compare
  • PM2.5: too few readings to compare
  • NO₂: too few readings to compare
  • SO₂: too few readings to compare

Show

Nitrogen dioxide NO₂

86.6

Nowµg/m³

Measured at 21:00

44.7

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

28.8

Last 7 daysµg/m³

measured in 100 % of hours · provisional

too few readings

Last 30 days

measured in 49 % of hours · provisional

too few readings

Last 12 months

measured in 76 % of hours · 3 months with too few readings · provisional

Days in 2025: NO₂, daily average above 85 µg/m³

No measured day above the limit.

1102031JanFebMarAprMayJunJulAugSepOctNovDec
  • above the limit
  • below the limit
  • too few readings for the day
  • no NO₂ data in the EEA database

Months of 2025

MonthDays above 85Hours above 200Highest dayNo readings
January00640
February00560
March00550
April00400
May00340
June00330
July00390
August00420
September00520
October00420
November00610
December00580

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 97 µg/m³, latest 87 µg/m³ (21:00)0100200300ThuFriSatSunMonTueWedhighest 97latest 87 (21:00)
measuredmodel estimate, not countedlegal hourly limit, 200 µg/m³
Last 7 days, every hour: NO₂ in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
22:0023model estimate, not counted
21:0086.6
20:0097.2
19:0061.2
18:0068
17:0054.2
16:0027.3
15:0031.1
14:0026.5
13:0025.8
12:0043.4
11:0063.9
10:0061.2
09:0061.3
08:0054.9
07:0036.9
06:0018.3
05:0014.7
04:0013.6
03:0016.9
02:0021.4
01:0040.2
Tuesday, 10/6
00:0058.9
23:0065.3
22:0078.7
21:0088
20:0078.6
19:0012.3
18:0020.5
17:0019.9
16:008.9
15:0014.2
14:0013.9
13:0032.2
12:0028.3
11:0044
10:0058.6
09:0053.5
08:0063.9
07:0037.2
06:0018.9
05:0014.6
04:0017.5
03:0022
02:0024.3
01:0041.5
Monday, 10/5
00:0057.8
23:0058.3
22:0074
21:0081.5
20:0075.9
19:0016.4
18:0010.2
17:0024.5
16:0017.2
15:0021
14:0026.5
13:0039.6
12:0031.2
11:0036.8
10:0042.9
09:0046
08:0070.1
07:0035
06:0016.7
05:0014.2
04:0017.4
03:0018
02:0021
01:0028.6
Sunday, 10/4
00:0043.6
23:0047.6
22:0064.9
21:0077.8
20:0069.2
19:0011.9
18:0012.7
17:0010.3
16:009.4
15:003.4
14:009.8
13:009.8
12:0011.8
11:0013.6
10:0019.6
09:0024
08:0029.9
07:0026.7
06:0015.3
05:0017.8
04:0022.7
03:0026.3
02:0048.2
01:0047
Saturday, 10/3
00:0053.8
23:0063.9
22:0060.1
21:0049.1
20:0029
19:008.9
18:004.3
17:003.3
16:008.1
15:003.2
14:004.8
13:005.1
12:0022.2
11:0021.6
10:0029.3
09:0029.1
08:0036.7
07:0022.6
06:0015.4
05:0015.7
04:0027.1
03:0031.1
02:0046.6
01:0063
Friday, 10/2
00:0057.3
23:0047.1
22:0058.6
21:0068
20:0020.8
19:0016.4
18:0013.2
17:0011.5
16:005.7
15:002.7
14:003.9
13:008.8
12:0021
11:0029.4
10:0048.6
09:0055.6
08:0080.8
07:0032.3
06:0017.3
05:0014.4
04:0023.5
03:0021.4
02:0019.4
01:0038.8
Thursday, 10/1
00:0047.8
23:0049.9
22:0032.8
21:005.4
20:009.9
19:008.2
18:005.6
17:006.6
16:008.8
15:005.3
14:006.1
13:004.5
12:0010.4
11:0038.4
10:0058
09:0052.4
08:0045.3
07:0037.3
06:0019
05:009.5
04:0011.4
03:0013.4
02:0024.3
01:0034.1
Last 30 days, daily average: NO₂ in µg/m³highest 38 µg/m³, latest 38 µg/m³0501009/99/169/239/30highest 38
too few readingslegal daily limit, 85 µg/m³no data from the station
Last 30 days, daily average: NO₂ in µg/m³
Values as a table
Dayµg/m³Note
Tue, 10/638.2provisional
Mon, 10/536.7provisional
Sun, 10/428.1provisional
Sat, 10/327.3provisional
Fri, 10/229.9provisional
Thu, 10/122.7provisional
Wed, 9/3019.3provisional
Tue, 9/2929.3provisional
Mon, 9/2825.9provisional
Sun, 9/2718.3provisional
Sat, 9/2619.3provisional
Fri, 9/2519.7provisional
Thu, 9/2419.6provisional
Wed, 9/2321.7provisional
Tue, 9/22too few readings
Mon, 9/21no data from the station
Sun, 9/20no data from the station
Sat, 9/19no data from the station
Fri, 9/18no data from the station
Thu, 9/17no data from the station
Wed, 9/16no data from the station
Tue, 9/15no data from the station
Mon, 9/14no data from the station
Sun, 9/13no data from the station
Sat, 9/12no data from the station
Fri, 9/11no data from the station
Thu, 9/10no data from the station
Wed, 9/9no data from the station
Tue, 9/8no data from the station
Mon, 9/7no data from the station
Last 12 months, monthly average: NO₂ in µg/m³highest 43 µg/m³, latest 30 µg/m³0204060DecFebAprJunAugOcthighest 43latest 30
Last 12 monthsthis month so fara year earlierlegal 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 far30.428.8measured in 100 % of hours · provisional · year before: same days
September 2026too few readings29.7measured in 30 % of hours · provisional · 20 days without data from the station
August 20262630.8measured in 99 % of hours · provisional
July 202620.9too few readingsmeasured in 82 % of hours · provisional
June 2026too few readings23.5measured in 66 % of hours · provisional · 1 day without data from the station
May 2026too few readings22measured in 14 % of hours · provisional · 1 day without data from the station
April 2026too few readings24.5measured in 33 % of hours · provisional · 4 days without data from the station
March 20263433.2measured in 100 % of hours · provisional
February 202632.440.6measured in 99 % of hours · provisional
January 202643.339.6measured in 86 % of hours · provisional · 2 days without data from the station
December 20253535.1measured in 100 % of hours · verified
November 202531.234.3measured in 100 % of hours · verified

NO₂ by year

Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)

Measure2026*20252024
Days above 85 µg/m³ (none allowed)0²00
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 (legal limit 40)too few30.931.3
Highest daily average, µg/m³69January 1364January 671January 17
Highest hourly value, µg/m³111January 12127November 24139January 17
Hours measured68 %93 %100 %
Days without any reading from the station2800

* 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 2025 there were 20 such days.
  • WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2025 there were 235 such days.
  • EU from 2030: annual average 20 µg/m³. Average in 2025: 31 µg/m³.
  • WHO 2021: annual average 10 µg/m³. Average in 2025: 31 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: 35

7 outages, 836 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

FromToDuration
Sep 1, 2026 08:00Sep 22, 2026 09:0021 days
Jun 9, 2026 04:00Jun 11, 2026 11:002 days
May 22, 2026 23:00May 24, 2026 08:0033 hours
Apr 10, 2026 03:00Apr 13, 2026 11:003 days
Apr 4, 2026 12:00Apr 7, 2026 09:003 days
Jan 26, 2026 14:00Jan 28, 2026 14:002 days
Jan 9, 2026 13:00Jan 11, 2026 11:0046 hours

Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.

Who is responsible

Air quality in the Federation of BiH is monitored by three networks of stations: the federal, the cantonal and the municipal one (Air Protection Act, Official Gazette FBiH 72/24, Art. 12 to 16).

Federal Hydrometeorological Institute (FHMZ)
Runs the federal network, collects the data of all networks and publishes it. It issues a report every month and, every year by 31 July, the annual air quality report (Art. 14, 19 and 63).
Canton
Sets up the cantonal network and is responsible for the measures. When limit values are exceeded, it adopts an air quality plan. When warning or alert thresholds are at risk of being exceeded, it adopts a short-term intervention plan. When the information threshold or a concentration dangerous to health is exceeded, it informs the public (Art. 15, 22, 25, 27 and 61).
Municipality
May run its own stations with the consent of the canton and must publish their results (Art. 16 and 17).
Inspectorates
The inspectorates of the Federation, the canton and the municipality supervise the law and the measures, each within its remit (Art. 71).

What the law requires when a limit is exceeded

A limit value is not a recommendation. The deadline for meeting the limit values for sulphur dioxide, nitrogen dioxide and particulate matter expired on 1 January 2021. Since then only the number of exceedances that the Pravilnik allows applies (Official Gazette FBiH 1/12, Annex X). The Air Protection Act adds that limit values, once met, must not be exceeded again (Art. 5(4)).

The law allows: for PM10 at most 35 days a year above 50 µg/m³, for sulphur dioxide at most 24 hours above 350 µg/m³ and at most 3 days above 125 µg/m³, for nitrogen dioxide at most 18 hours above 200 µg/m³ and no day with a daily average above 85 µg/m³ (Annex X).

When limits are exceeded, the canton adopts an air quality plan with measures that shorten the period of exceedance. The plan is published within eight days of adoption (Art. 8, 25, 26 and 63).

The alert thresholds are 500 µg/m³ for sulphur dioxide and 400 µg/m³ for nitrogen dioxide over three hours in a row, and 300 µg/m³ for PM10 and 280 µg/m³ for PM2.5 as a daily average (Pravilnik, Annex XIV, amended in Official Gazette FBiH 3/21). When such a situation threatens, the canton must have a short-term intervention plan. It can restrict traffic, construction work, the operation of plants and heating (Art. 27 and 28).

When the information threshold or a concentration dangerous to health is exceeded, the competent cantonal authorities inform the public through radio, television, newspapers and the internet: where, since when, how much was measured, what is expected and how to protect oneself (Art. 61 and 62).

The limit values in BiH match the EU rules of 2008. Since 2021 the World Health Organization has recommended much lower values, for PM10 45 µg/m³ a day and 15 µg/m³ a year. From 2030 the EU lowers the annual PM10 limit to 20 µg/m³ (Directive (EU) 2024/2881).

We checked the rules against the published texts on 7 October 2026.

Where the data comes from

Measured by Federal Hydrometeorological Institute. 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 limits are the legal limits of the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19 and 3/21, Annexes X and XIV). They match EU Directive 2008/50/EC. 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

Other stations in Tuzla

samoEKO is a brand of samoLabs, Juelich.