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Air at the Zenica - Brist station

Zenica, Zenica-Doboj Canton · Federation of Bosnia and Herzegovina

Network: Federal Hydrometeorological Institute · Station code: BA0002A

This year, up to yesterday (October 7)

at least

27 days

with a daily average of particulate matter PM10 above the legal limit of 50 µg/m³.

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

In 2025: 72 days above the limit, 35 allowed.

at least

1 day

with an 8-hour average of ozone (O₃) above the target value of 120 µg/m³.

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

Worst day: January 23, 2026, PM10 165 µg/m³ as a daily average, 3.3 times the limit.

At least 1 day with a daily average of PM10 above 150 µg/m³, the warning threshold in the Federation of BiH.

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 222 of 280 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

Moderate

Air now · Measured at 22:00

Latest values

Latest value: Wed 22:00

Readings
PollutantValueLevel
PM1077.3 µg/m³Moderate
NO₂30.4 µg/m³Moderate
O₃13.2 µg/m³Good
SO₂39.2 µg/m³Fair

How the air is changing

Over the last seven days there was more PM10, NO₂, and O₃ and less SO₂ in the air than the week before.

  • PM10: average 34.8 µg/m³, week before 21.8 µg/m³
  • NO₂: average 15.7 µg/m³, week before 13 µg/m³
  • O₃: average 12.1 µg/m³, week before 10.5 µg/m³
  • SO₂: average 20.4 µg/m³, week before 22.8 µg/m³

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

  • PM10: too few readings to compare
  • NO₂: too few readings to compare
  • O₃: too few readings to compare
  • SO₂: too few readings to compare

Show

Particulate matter PM10

77.3

Nowµg/m³

Measured at 22:00

52.9

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

34.8

Last 7 daysµg/m³

measured in 99 % of hours · provisional

too few readings

Last 30 days

measured in 52 % of hours · provisional

too few readings

Last 12 months

measured in 87 % of hours · 1 month with too few readings · provisional

Days in 2026: PM10, daily average above 50 µg/m³

27 days above the limit. 36 days without any reading from the station.

1102031JanJan 1: 76 µg/m³, above the limitJan 4: 51 µg/m³, above the limitJan 10: no data from the stationJan 12: 81 µg/m³, above the limitJan 13: 115 µg/m³, above the limitJan 14: 113 µg/m³, above the limitJan 15: 108 µg/m³, above the limitJan 16: 95 µg/m³, above the limitJan 17: 87 µg/m³, above the limitJan 18: 70 µg/m³, above the limitJan 19: 55 µg/m³, above the limitJan 20: 71 µg/m³, above the limitJan 21: 90 µg/m³, above the limitJan 22: 137 µg/m³, above the limitJan 23: 165 µg/m³, above the limitJan 24: 142 µg/m³, above the limitJan 25: 84 µg/m³, above the limitJan 27: no data from the stationFebFeb 3: 65 µg/m³, above the limitMarAprApr 5: no data from the stationApr 6: no data from the stationApr 11: no data from the stationApr 12: no data from the stationMayJunJun 10: no data from the stationJun 27: no data from the stationJun 28: no data from the stationJun 29: no data from the stationJun 30: no data from the stationJulJul 1: no data from the stationJul 2: no data from the stationJul 3: no data from the stationJul 4: no data from the stationJul 5: no data from the stationJul 7: 91 µg/m³, above the limitJul 8: 54 µg/m³, above the limitJul 9: 64 µg/m³, above the limitJul 10: 74 µg/m³, above the limitJul 11: 102 µg/m³, above the limitJul 12: 55 µg/m³, above the limitAugAug 28: 64 µg/m³, above the limitAug 29: 73 µg/m³, above the limitSepSep 2: no data from the stationSep 3: no data from the stationSep 4: no data from the stationSep 5: no data from the stationSep 6: no data from the stationSep 7: no data from the stationSep 8: no data from the stationSep 9: no data from the stationSep 10: no data from the stationSep 11: no data from the stationSep 12: no data from the stationSep 13: no data from the stationSep 14: no data from the stationSep 15: no data from the stationSep 16: no data from the stationSep 17: no data from the stationSep 18: no data from the stationSep 19: no data from the stationSep 20: no data from the stationSep 21: no data from the stationOctOct 6: 57 µg/m³, above the limitOct 7: 53 µg/m³, above the limitNovDec
  • above the limit
  • below the limit
  • too few readings for the day
  • no data from the station
Days above the limit with values (27)
  1. Jan 1 76
  2. Jan 4 51
  3. Jan 12 81
  4. Jan 13 115
  5. Jan 14 113
  6. Jan 15 108
  7. Jan 16 95
  8. Jan 17 87
  9. Jan 18 70
  10. Jan 19 55
  11. Jan 20 71
  12. Jan 21 90
  13. Jan 22 137
  14. Jan 23 165
  15. Jan 24 142
  16. Jan 25 84
  17. Feb 3 65
  18. Jul 7 91
  19. Jul 8 54
  20. Jul 9 64
  21. Jul 10 74
  22. Jul 11 102
  23. Jul 12 55
  24. Aug 28 64
  25. Aug 29 73
  26. Oct 6 57
  27. Oct 7 53

Values in µg/m³, limit 50 µg/m³.

Months of 2026

MonthDays above 50Highest dayNo readings
January16 above the number allowed1652
February1 above the number allowed650
March0380
April0224
May040
June0475
July6 above the number allowed1025
August2 above the number allowed730
September02720
October up to yesterday2 above the number allowed570

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: PM10 in µg/m³highest 110 µg/m³, latest 77 µg/m³ (22:00)050100150ThuFriSatSunMonTueWedlatest 77 (22:00)
measuredmodel estimate, not countedday above the limit (daily average)
Last 7 days, every hour: PM10 in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
00:0052model estimate, not counted
23:0055model estimate, not counted
22:0077.3
21:0070.3
20:0072.9
19:0059.4
18:0043.8
17:0027.7
16:0031.3
15:0043.4
14:0041.5
13:0073.1
12:0085.5
11:0069.3
10:0087.8
09:0056.7
08:0043.8
07:0037.3
06:0035
05:0034.3
04:0035
03:0038.2
02:0046.2
01:0055.1
Tuesday, 10/6
00:0058.9
23:0066.8
22:0080.1
21:0091.3
20:0082.9
19:0061.3
18:0065
17:0064.7
16:0058.4
15:0096.9
14:00110.2
13:0075.7
12:0054.7
11:0053.5
10:0062.8
09:0045.2
08:0031
07:0023.7
06:0023.2
05:0023.4
04:0025.7
03:0035.2
02:0040.3
01:0042.7
Monday, 10/5
00:0045.7
23:0049.1
22:0057.8
21:0043
20:0032.6
19:0047.1
18:0027.4
17:0020
16:0014.6
15:0016.3
14:0026.6
13:0027.5
12:0029.3
11:0038.7
10:0045.9
09:0030
08:0035.2
07:0019.7
06:0018.2
05:0017
04:0020.4
03:0020.3
02:0023.6
01:0034.7
Sunday, 10/4
00:0032.3
23:0034.1
22:0045.4
21:0037.9
20:0037.3
19:0022.5
18:0015.4
17:0017.5
16:0011.7
15:007.8
14:0016.9
13:0018.7
12:0018.6
11:0026.8
10:0033.2
09:0027.9
08:0019.5
07:0017.9
06:0015.2
05:0015.7
04:0018.7
03:0023.5
02:0028.1
01:0031.4
Saturday, 10/3
00:0038.6
23:0038.1
22:0040
21:0031.6
20:0030.5
19:0027.1
18:0025.7
17:0019.7
16:0015.2
15:0016.9
14:0015.5
13:0024
12:0025.3
11:0030.5
10:0034.9
09:0032.5
08:0021.6
07:0017.9
06:0016.7
05:0018.3
04:0022.1
03:0030.7
02:0032.7
01:0035.1
Friday, 10/2
00:0037.7
23:0045.7
22:0045
21:0025.3
20:0026
19:0024.6
18:0019.9
17:0014.5
16:0017.3
15:0019.5
14:0015
13:0018.9
12:0028.8
11:0041.9
10:0041.4
09:0033.1
08:0021.7
07:0016
06:0016.5
05:0018.6
04:0021.3
03:0025.2
02:0035
01:0067.5
Thursday, 10/1
00:0056.4
23:0041
22:0032.2
21:0019.3
20:0026.6
19:0023.9
18:0023.5
17:0018
16:0016.1
15:0014.6
14:0014.5
13:0016.3
12:0020.9
11:0030.8
10:0041.2
09:0036.5
08:0022.9
07:0020.3
06:0018.5
05:0017.1
04:0018.4
03:0020.9
02:0024.1
Last 30 days, daily average: PM10 in µg/m³ · 2 days above the limithighest 57 µg/m³, latest 53 µg/m³02040609/109/179/2410/1latest 53
day above the limittoo few readingslegal daily limit, 50 µg/m³no data from the station
Last 30 days, daily average: PM10 in µg/m³ · 2 days above the limit
Values as a table
Dayµg/m³Note
Wed, 10/752.9above the limit · provisional
Tue, 10/657.2above the limit · provisional
Mon, 10/530.9provisional
Sun, 10/423.9provisional
Sat, 10/326.7provisional
Fri, 10/228.2provisional
Thu, 10/125.1provisional
Wed, 9/3025.3provisional
Tue, 9/2924.6provisional
Mon, 9/2824.7provisional
Sun, 9/2726.8provisional
Sat, 9/2623.3provisional
Fri, 9/2511.6provisional
Thu, 9/2416.6provisional
Wed, 9/2314.6provisional
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
Last 12 months, monthly average: PM10 in µg/m³highest 71 µg/m³, latest 35 µg/m³0255075DecFebAprJunAugOcthighest 71latest 35
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: PM10 in µg/m³
Values as a table
Monthµg/m³a year earlierNote
October 2026 so far34.824measured in 99 % of hours · provisional · year before: same days
September 2026too few readings24.1measured in 30 % of hours · provisional · 20 days without data from the station
August 202626.425.2measured in 97 % of hours · provisional
July 202635.827.8measured in 77 % of hours · provisional · 5 days without data from the station
June 20266.822.5measured in 77 % of hours · provisional · 5 days without data from the station
May 20262.729.9measured in 93 % of hours · provisional
April 2026730.1measured in 79 % of hours · provisional · 4 days without data from the station
March 20263138.1measured in 100 % of hours · provisional
February 202637.760measured in 100 % of hours · provisional
January 202671.157measured in 88 % of hours · provisional · 2 days without data from the station
December 202570.545.3measured in 98 % of hours · verified
November 202539.153.7measured in 100 % of hours · verified

PM10 by year

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

Measure2026*20252024
Days above 50 µg/m³ (allowed 35)≥ 27²72 above the number allowed≥ 37 above the number allowed
Days above 150 µg/m³ (warning threshold FBiH)≥ 1 above the number allowed1 above the number allowed0
Days above 300 µg/m³ (alert threshold FBiH)000
Annual average, µg/m³ (legal limit 40)too few37.4too few
Highest daily average, µg/m³165January 23159December 21102November 28
Highest hourly value, µg/m³205January 23227December 11169January 5
Hours measured83 %98 %26 %
Days without any reading from the station3607

* 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.

Unverified hourly values of particulate matter from 975 µg/m³ up, and single spikes from 500 µg/m³ up between low values, count as missing. In the verified data for BiH from 2023 to 2025 no hour was above 600 µg/m³.

■ 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 45 µg/m³, 18 days allowed. In 2026 there were 29 such days.
  • WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2026 there were 29 such days.

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

The worst days of 2026

DayAverageTimes the limit
Jan 23, 2026provisional1653.3 ×
Jan 24, 2026provisional1422.8 ×
Jan 22, 2026provisional1372.7 ×
Jan 13, 2026provisional1152.3 ×
Jan 14, 2026provisional1132.3 ×

Daily average in µg/m³, daily limit 50 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: 44

8 outages, 1,066 hours in total in the last 12 months.

Timeline of outages from October 8, 2025 to today

FromToDuration
Sep 1, 2026 09:00Sep 22, 2026 09:0021 days
Jun 26, 2026 15:00Jul 6, 2026 12:0010 days
Jun 9, 2026 05:00Jun 11, 2026 11:002 days
May 23, 2026 01:00May 24, 2026 08:0031 hours
Apr 10, 2026 04:00Apr 13, 2026 11:003 days
Apr 4, 2026 12:00Apr 7, 2026 09:003 days
Jan 26, 2026 15:00Jan 28, 2026 14:0047 hours
Jan 9, 2026 14:00Jan 11, 2026 11:0045 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). In Zenica-Doboj Canton the Ministry of Physical Planning, Transport, Communications and Environmental Protection is responsible for environmental protection. The 2024 intervention plan was adopted by the Government of the canton.
Municipality
May run its own stations with the consent of the canton and must publish their results (Art. 16 and 17). Under the Zenica-Doboj Canton intervention plan (Official Gazette ZDK 3/24, Art. 3), the mayor of the municipality or city declares readiness based on the report of the authorised expert institution, and warning and alert based on the decision of the operational headquarters.
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).

In Zenica-Doboj Canton the procedure is set by the intervention plan (Official Gazette ZDK 3/24) in three stages: readiness, warning and alert. An alert also requires a forecast of stable weather for the next 48 hours.

The canton also has an Action Plan for Air Quality Protection from 2020 (Official Gazette ZDK 9/20), adopted under the earlier law. We could not tell from the published decision how long it applies.

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 Zenica

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