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Air at the Zenica - Tetovo station

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

Network: Federal Hydrometeorological Institute · Station code: BA0038A

In 2024

at least

24 days

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

3 days are allowed in the whole year.

The number allowed for the whole year has been exceeded.

at least 21 days more than allowed

at least

46 hours

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

24 hours are allowed in the whole year.

The number allowed for the whole year has been exceeded.

at least 22 hours more than allowed

Worst day: February 5, 2024, SO₂ 277 µg/m³ as a daily average, 2.2 times the limit.

SO₂ was above the alert threshold of 500 µg/m³ for at least 3 hours, three or more hours in a row (on 1 day).

At least 4 days 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.

Also: at least 57 days above the legal daily limit for PM10 of 50 µg/m³ (35 allowed).

Daily average for 172 of 366 days · Yardstick: legal limits in the Federation of BiH (Pravilnik, Official Gazette FBiH 1/12, 50/19, 3/21)

All figures by year and month

No data is arriving from this station

No reading has arrived from this station in 2026 so far.

We take the readings from the European Environment Agency (EEA), and no new values for this station are coming from there. The cause may lie with the station itself or with the data transmission.

Last reading in the archive: January 1, 2025 at 00:00
Measured then: NO₂ 54.1 µg/m³

All outages of this station

Zenica still has readings: the Zenica - Brist station, about 3 km from here, is sending data.

To the Zenica - Brist station page

How the air is changing

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

  • PM10: too few readings to compare
  • PM2.5: too few readings to compare
  • NO₂: too few readings to compare
  • O₃: too few readings to compare
  • SO₂: too few readings to compare

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

Show

Sulphur dioxide SO₂

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

too few readings

Last 7 days

measured in 0 % of hours

too few readings

Last 30 days

measured in 0 % of hours

too few readings

Last 12 months

measured in 0 % of hours

Days in 2023: SO₂, daily average above 125 µg/m³

36 days above the limit.

1102031JanJan 4: 136 µg/m³, above the limitJan 8: 132 µg/m³, above the limitFebFeb 1: 130 µg/m³, above the limitFeb 11: 140 µg/m³, above the limitFeb 12: 194 µg/m³, above the limitFeb 13: 127 µg/m³, above the limitFeb 16: 150 µg/m³, above the limitFeb 17: 130 µg/m³, above the limitMarAprMayJunJulAugSepOctNovNov 20: 135 µg/m³, above the limitNov 21: 135 µg/m³, above the limitNov 23: 135 µg/m³, above the limitNov 24: 177 µg/m³, above the limitNov 27: 176 µg/m³, above the limitNov 28: 174 µg/m³, above the limitNov 30: 132 µg/m³, above the limitDecDec 3: 177 µg/m³, above the limitDec 5: 229 µg/m³, above the limitDec 7: 151 µg/m³, above the limitDec 8: 162 µg/m³, above the limitDec 9: 199 µg/m³, above the limitDec 10: 223 µg/m³, above the limitDec 11: 157 µg/m³, above the limitDec 12: 181 µg/m³, above the limitDec 13: 206 µg/m³, above the limitDec 14: 147 µg/m³, above the limitDec 15: 173 µg/m³, above the limitDec 16: 213 µg/m³, above the limitDec 17: 166 µg/m³, above the limitDec 18: 200 µg/m³, above the limitDec 19: 191 µg/m³, above the limitDec 20: 197 µg/m³, above the limitDec 21: 273 µg/m³, above the limitDec 22: 182 µg/m³, above the limitDec 23: 175 µg/m³, above the limitDec 24: 223 µg/m³, above the limitDec 29: 150 µg/m³, above the limit
  • above the limit
  • below the limit
  • too few readings for the day
  • no SO₂ data in the EEA database
Days above the limit with values (36)
  1. Jan 4 136
  2. Jan 8 132
  3. Feb 1 130
  4. Feb 11 140
  5. Feb 12 194
  6. Feb 13 127
  7. Feb 16 150
  8. Feb 17 130
  9. Nov 20 135
  10. Nov 21 135
  11. Nov 23 135
  12. Nov 24 177
  13. Nov 27 176
  14. Nov 28 174
  15. Nov 30 132
  16. Dec 3 177
  17. Dec 5 229
  18. Dec 7 151
  19. Dec 8 162
  20. Dec 9 199
  21. Dec 10 223
  22. Dec 11 157
  23. Dec 12 181
  24. Dec 13 206
  25. Dec 14 147
  26. Dec 15 173
  27. Dec 16 213
  28. Dec 17 166
  29. Dec 18 200
  30. Dec 19 191
  31. Dec 20 197
  32. Dec 21 273
  33. Dec 22 182
  34. Dec 23 175
  35. Dec 24 223
  36. Dec 29 150

Values in µg/m³, limit 125 µg/m³.

Months of 2023

MonthDays above 125Hours above 350Highest dayNo readings
January2 above the number allowed11360
February6 above the number allowed51940
March00960
April00830
May00700
June00530
July00440
August00440
September00410
October061200
November7 above the number allowed51770
December21 above the number allowed282730

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.

There are no readings for this period.

Last 7 days, every hour: SO₂ in µg/m³
Last 30 days, daily average: SO₂ in µg/m³There are no readings for this period.00.519/99/169/239/30
no data from the station
Last 30 days, daily average: SO₂ in µg/m³
Values as a table
Dayµg/m³Note
Tue, 10/6no data from the station
Mon, 10/5no data from the station
Sun, 10/4no data from the station
Sat, 10/3no data from the station
Fri, 10/2no data from the station
Thu, 10/1no data from the station
Wed, 9/30no data from the station
Tue, 9/29no data from the station
Mon, 9/28no data from the station
Sun, 9/27no data from the station
Sat, 9/26no data from the station
Fri, 9/25no data from the station
Thu, 9/24no data from the station
Wed, 9/23no data from the station
Tue, 9/22no data from the station
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

There are no readings for this period.

Last 12 months, monthly average: SO₂ in µg/m³
Values as a table
Monthµg/m³a year earlierNote
October 2026 so fartoo few readings6 days without data from the station
September 2026too few readings30 days without data from the station
August 2026too few readings31 days without data from the station
July 2026too few readings31 days without data from the station
June 2026too few readings30 days without data from the station
May 2026too few readings31 days without data from the station
April 2026too few readings30 days without data from the station
March 2026too few readings31 days without data from the station
February 2026too few readings28 days without data from the station
January 2026too few readings31 days without data from the station
December 2025too few readings31 days without data from the station
November 2025too few readings30 days without data from the station

SO₂ by year

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

Measure20242023
Days above 125 µg/m³ (allowed 3)≥ 24 above the number allowed36 above the number allowed
Hours above 350 µg/m³ (allowed 24)≥ 46 above the number allowed45 above the number allowed
Hours above 500 µg/m³, three hours in a row (alert threshold)≥ 3 above the number allowed0
Annual average, µg/m³ (legal limit 50)too few61.8 above the number allowed
Highest daily average, µg/m³277February 5273December 21
Highest hourly value, µg/m³1,102February 5636December 21
Hours measured50 %96 %
Days without any reading from the station70

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

■ 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.

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 2023 there were 169 such days.
  • WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2023 there were 195 such days.
  • EU from 2030: annual average 20 µg/m³. Average in 2023: 62 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.

The worst days of 2023

DayAverageTimes the limit
Dec 21, 20232732.2 ×
Dec 5, 20232291.8 ×
Dec 24, 20232231.8 ×
Dec 10, 20232231.8 ×
Dec 16, 20232131.7 ×

Daily average in µg/m³, daily limit 125 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: 280

1 outage, 6,715 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

Grey: for 2025 the archive has no hour from this station, because the EEA's verified annual delivery does not include it. We do not count this as an outage.

FromToDuration
January 1, 2026 or earlierstill ongoingat least 279 days

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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