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Air at the Bihac station

Bihać, Una-Sana Canton · Federation of Bosnia and Herzegovina

Network: Federal Hydrometeorological Institute · Station code: BA0058A

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

at least

39 days

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

The target value allows 25 such days a year, averaged over three years.

at least

5 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.

Worst day: July 16, 2026, O₃ 375 µg/m³ as a daily average, 3.1 times the limit.

Also: at least 3 hours above the legal hourly limit for SO₂ of 350 µg/m³ (too few readings to compare with the allowed number).

Also: at least 2 hours above the legal hourly limit for NO₂ of 200 µg/m³ (too few readings to compare with the allowed number).

Daily average for 195 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 08:00

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 08:00
Measured then: NO₂ 19 µg/m³, O₃ 44.4 µg/m³, PM10 13.3 µg/m³, SO₂ 2.1 µg/m³

All outages of this station

Nearest station measuring now: Plitvička Jezera, Croatia, about 23 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

Ozone O₃

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 56 % of hours · provisional

Days in 2024: O₃, 8-hour average above 120 µg/m³

16 days above the limit. 9 days without any reading from the station.

1102031JanFebMarAprApr 9: 125 µg/m³, above the limitApr 10: 124 µg/m³, above the limitApr 15: 125 µg/m³, above the limitApr 16: 131 µg/m³, above the limitMayMay 12: 125 µg/m³, above the limitJunJulJul 21: 121 µg/m³, above the limitAugAug 2: 129 µg/m³, above the limitAug 13: 123 µg/m³, above the limitAug 15: 124 µg/m³, above the limitAug 16: 122 µg/m³, above the limitAug 28: 121 µg/m³, above the limitAug 29: 127 µg/m³, above the limitAug 30: 122 µg/m³, above the limitAug 31: 126 µg/m³, above the limitSepSep 1: 121 µg/m³, above the limitSep 2: 121 µg/m³, above the limitOctOct 12: no data from the stationOct 13: no data from the stationOct 14: no data from the stationOct 15: no data from the stationOct 16: no data from the stationOct 17: no data from the stationOct 18: no data from the stationOct 19: no data from the stationOct 20: no data from the stationNovDec
  • above the limit
  • below the limit
  • too few readings for the day
  • no data from the station
Days above the limit with values (16)
  1. Apr 9 125
  2. Apr 10 124
  3. Apr 15 125
  4. Apr 16 131
  5. May 12 125
  6. Jul 21 121
  7. Aug 2 129
  8. Aug 13 123
  9. Aug 15 124
  10. Aug 16 122
  11. Aug 28 121
  12. Aug 29 127
  13. Aug 30 122
  14. Aug 31 126
  15. Sep 1 121
  16. Sep 2 121

Values in µg/m³, limit 120 µg/m³.

Months of 2024

MonthDays above 120Highest 8 hNo readings
January0860
February01040
March01160
April4 above the number allowed1310
May1 above the number allowed1250
June01180
July1 above the number allowed1210
August8 above the number allowed1290
September2 above the number allowed1210
October0979
November0960
December0900

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: O₃ in µg/m³
Last 30 days, highest 8-hour average of the day: O₃ in µg/m³There are no readings for this period.00.519/99/169/239/30
no data from the station
Last 30 days, highest 8-hour average of the day: O₃ 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: O₃ in µg/m³highest 120 µg/m³, latest 120 µg/m³050100150DecFebAprJunAugOcthighest 120
Last 12 monthsa year earliermonth with days without data from the station
Last 12 months, monthly average: O₃ 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 2026119.7measured in 92 % of hours · provisional
June 202699.3measured in 93 % of hours · provisional · 1 day without data from the station
May 202665.1measured in 94 % of hours · provisional
April 202650.5measured in 79 % of hours · provisional · 4 days without data from the station
March 202639.5measured in 100 % of hours · provisional
February 202630.8measured in 100 % of hours · provisional
January 202648.1measured in 88 % of hours · provisional · 2 days without data from the station
December 2025too few readings31.331 days without data from the station
November 2025too few readings4230 days without data from the station

O₃ by year

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

Measure2026*20242023
Days with 8-hour average above 120 µg/m³ (target value 25)≥ 3916234
Annual average, µg/m³too few56.991.2
Highest 8-hour average, µg/m³375July 16131April 16235June 18
Hours measured73 %97 %100 %
Days without any reading from the station6490

* 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.

■ and a figure in red: more than is allowed for the whole year.

The worst days of 2024

DayHighest 8 hTimes the limit
Apr 16, 20241311.1 ×
Aug 2, 20241291.1 ×
Aug 29, 20241271.1 ×
Aug 31, 20241261.0 ×
Apr 15, 20241251.0 ×

Daily average in µg/m³, daily limit 120 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: 73

8 outages, 1,753 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 08:00still ongoing58 days
Jul 1, 2026 09:00Jul 2, 2026 09:0024 hours
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).
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).

We show measured values only. Whether an episode has been declared is decided by the competent authorities, who publish it on their own pages.

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

samoEKO is a brand of samoLabs, Juelich.