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Air at the Tesanj station

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

Network: Federal Hydrometeorological Institute · Station code: BA0056A

This year, up to the last reading (August 10)

at least

3 days

with a daily average of nitrogen dioxide (NO₂) above the legal limit of 85 µg/m³.

No such day is allowed.

The number allowed for the whole year has been exceeded.

at least 3 days more than allowed

at least

21 days

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 13, 2026, NO₂ 105 µg/m³ as a daily average, 1.2 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.

Also: at least 7 hours above the legal hourly limit for NO₂ of 200 µg/m³ (too few readings to compare with the allowed number).

Also: at least 1 day above the legal daily limit for SO₂ of 125 µg/m³ (too few readings to compare with the allowed number).

Also: at least 11 days above the legal daily limit for PM10 of 50 µg/m³ (too few readings to compare with the allowed number).

Daily average for 106 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

No data has arrived from this station since August 10, 2026 at 09:00

No reading for 58 days.

On the FHMZ website this station showed current hourly values on October 7, 2026. The data is just not reaching the EEA database, which is where we take it from. The station on the FHMZ website

This station is one of 5 stations in the Federation of BiH from which no data has been arriving since August 10, 2026. The data stopped at almost the same time. When data from several stations stops within a few hours, the cause is probably shared, for example in the data transmission. Where exactly, we cannot tell from here.

Last reading: August 10, 2026 at 09:00
Measured then: NO₂ 14.2 µg/m³, O₃ 74.5 µg/m³, PM10 32.2 µg/m³, PM2.5 14.7 µg/m³, SO₂ 12.3 µg/m³

All outages of this station

Nearest station measuring now: Maglaj, about 12 km away.

That reading is from another place. Your air may be better or worse.

Go to that station

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

Nitrogen dioxide NO₂

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 38 % of hours · provisional

Days in 2026: NO₂, daily average above 85 µg/m³

3 days above the limit. 64 days without any reading from the station.

1102031JanJan 10: no data from the stationJan 13: 105 µg/m³, above the limitJan 15: 90 µg/m³, above the limitJan 16: 85 µg/m³, above the limitJan 27: no data from the stationFebMarAprApr 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 stationJulAugAug 11: no data from the stationAug 12: no data from the stationAug 13: no data from the stationAug 14: no data from the stationAug 15: no data from the stationAug 16: no data from the stationAug 17: no data from the stationAug 18: no data from the stationAug 19: no data from the stationAug 20: no data from the stationAug 21: no data from the stationAug 22: no data from the stationAug 23: no data from the stationAug 24: no data from the stationAug 25: no data from the stationAug 26: no data from the stationAug 27: no data from the stationAug 28: no data from the stationAug 29: no data from the stationAug 30: no data from the stationAug 31: no data from the stationSepSep 1: no data from the stationSep 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 stationSep 22: no data from the stationSep 23: no data from the stationSep 24: no data from the stationSep 25: no data from the stationSep 26: no data from the stationSep 27: no data from the stationSep 28: no data from the stationSep 29: no data from the stationSep 30: no data from the stationOctOct 1: no data from the stationOct 2: no data from the stationOct 3: no data from the stationOct 4: no data from the stationOct 5: no data from the stationOct 6: no data from the stationNovDec
  • above the limit
  • below the limit
  • too few readings for the day
  • no NO₂ data in the EEA database
  • no data from the station
Days above the limit with values (3)
  1. Jan 13 105
  2. Jan 15 90
  3. Jan 16 85

Values in µg/m³, limit 85 µg/m³.

Months of 2026

MonthDays above 85Hours above 200Highest dayNo readings
January3 above the number allowed71052
February00130
March00170
April00154
May000
June0091
July00110
August001421
September30
October up to yesterday6

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: NO₂ in µg/m³
Last 30 days, daily average: NO₂ 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: NO₂ 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
Last 12 months, monthly average: NO₂ in µg/m³highest 34 µg/m³, latest 7 µg/m³0204060DecFebAprJunAugOcthighest 34latest 7
Last 12 monthsa 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 fartoo few readings6 days without data from the station
September 2026too few readings30 days without data from the station
August 2026too few readingsmeasured in 30 % of hours · provisional · 21 days without data from the station
July 20267.4measured in 95 % of hours · provisional
June 2026too few readingsmeasured in 28 % of hours · provisional · 1 day without data from the station
May 2026too few readingsmeasured in 26 % of hours · provisional
April 2026too few readingsmeasured in 47 % of hours · provisional · 4 days without data from the station
March 2026too few readingsmeasured in 73 % of hours · provisional
February 2026too few readingsmeasured in 72 % of hours · provisional
January 202633.7measured in 85 % of hours · provisional · 2 days without data from the station
December 2025too few readingstoo few readings31 days without data from the station
November 2025too few readings30 days without data from the station

NO₂ by year

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

Measure2026*20242023
Days above 85 µg/m³ (none allowed)≥ 3 above the number allowed0²0²
Hours above 200 µg/m³ (allowed 18)≥ 7²0²0²
Hours above 400 µg/m³, three hours in a row (alert threshold)000
Annual average, µg/m³ (legal limit 40)too fewtoo fewtoo few
Highest daily average, µg/m³105January 1355December 3040February 12
Highest hourly value, µg/m³270January 16100December 2887February 17
Hours measured50 %59 %77 %
Days without any reading from the station6404

* 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.

≥ 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.

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 2026 there were 6 such days.
  • WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2026 there were 13 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 13, 2026provisional1051.2 ×
Jan 15, 2026provisional901.1 ×
Jan 16, 2026provisional851.0 ×

Daily average in µg/m³, daily limit 85 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: 74

9 outages, 1,785 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
Aug 10, 2026 09:00still ongoing58 days
Jul 1, 2026 09:00Jul 2, 2026 09:0024 hours
Jun 9, 2026 05:00Jun 11, 2026 16:002 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
Mar 29, 2026 07:00Mar 30, 2026 13:0030 hours
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

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