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Air at the Visoko station

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

Network: Federal Hydrometeorological Institute · Station code: BA0055A

This year, up to yesterday (October 6)

at least

45 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 42 days more than allowed

at least

293 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 269 hours more than allowed

Worst day: January 22, 2026, SO₂ 595 µg/m³ as a daily average, 4.8 times the limit.

SO₂ was above the alert threshold of 500 µg/m³ for at least 73 hours, three or more hours in a row (on 9 days).

At least 2 days with a daily average of PM10 above 300 µg/m³, the alert 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).

Also: at least 17 days with an 8-hour average of ozone (O₃) above the target value of 120 µg/m³.

Daily average for 184 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 20:00

Latest values

Latest value: 20:00

Readings
PollutantValueLevel
PM10126.7 µg/m³Poor
O₃3 µg/m³Good

How the air is changing

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

  • PM10: average 33.1 µg/m³, week before 23.5 µg/m³
  • O₃: average 42.8 µg/m³, week before 33.7 µg/m³
  • SO₂: too few readings to compare

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

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

Show

Particulate matter PM10

126.7

Nowµg/m³

Measured at 20:00

50.6

Last 24 hoursµg/m³

measured in 92 % of hours · provisional

33.1

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 88 % of hours · 1 month with too few readings · provisional

Days in 2024: PM10, daily average above 50 µg/m³

67 days above the limit.

1102031JanJan 1: 67 µg/m³, above the limitJan 5: 64 µg/m³, above the limitJan 13: 64 µg/m³, above the limitJan 14: 95 µg/m³, above the limitJan 15: 134 µg/m³, above the limitJan 16: 61 µg/m³, above the limitJan 17: 84 µg/m³, above the limitJan 21: 111 µg/m³, above the limitJan 22: 163 µg/m³, above the limitJan 23: 206 µg/m³, above the limitJan 24: 135 µg/m³, above the limitJan 25: 183 µg/m³, above the limitJan 26: 96 µg/m³, above the limitJan 27: 92 µg/m³, above the limitJan 29: 99 µg/m³, above the limitJan 30: 114 µg/m³, above the limitJan 31: 139 µg/m³, above the limitFebFeb 1: 140 µg/m³, above the limitFeb 2: 121 µg/m³, above the limitFeb 3: 106 µg/m³, above the limitFeb 4: 111 µg/m³, above the limitFeb 5: 126 µg/m³, above the limitFeb 6: 74 µg/m³, above the limitFeb 7: 83 µg/m³, above the limitFeb 8: 55 µg/m³, above the limitFeb 15: 61 µg/m³, above the limitFeb 16: 83 µg/m³, above the limitFeb 17: 73 µg/m³, above the limitFeb 18: 55 µg/m³, above the limitFeb 19: 58 µg/m³, above the limitFeb 21: 53 µg/m³, above the limitMarMar 27: 86 µg/m³, above the limitAprApr 1: 56 µg/m³, above the limitMayJunJun 22: 53 µg/m³, above the limitJulAugSepOctOct 23: 50 µg/m³, above the limitOct 24: 60 µg/m³, above the limitOct 25: 59 µg/m³, above the limitOct 30: 51 µg/m³, above the limitOct 31: 53 µg/m³, above the limitNovNov 1: 53 µg/m³, above the limitNov 2: 56 µg/m³, above the limitNov 3: 68 µg/m³, above the limitNov 4: 55 µg/m³, above the limitNov 5: 65 µg/m³, above the limitNov 6: 79 µg/m³, above the limitNov 7: 62 µg/m³, above the limitNov 11: 58 µg/m³, above the limitNov 16: 57 µg/m³, above the limitNov 17: 88 µg/m³, above the limitNov 18: 115 µg/m³, above the limitNov 19: 102 µg/m³, above the limitNov 24: 75 µg/m³, above the limitNov 25: 93 µg/m³, above the limitNov 26: 124 µg/m³, above the limitNov 27: 131 µg/m³, above the limitNov 28: 129 µg/m³, above the limitDecDec 14: 74 µg/m³, above the limitDec 15: 52 µg/m³, above the limitDec 16: 93 µg/m³, above the limitDec 17: 104 µg/m³, above the limitDec 18: 92 µg/m³, above the limitDec 19: 80 µg/m³, above the limitDec 27: 76 µg/m³, above the limitDec 28: 66 µg/m³, above the limitDec 29: 60 µg/m³, above the limitDec 30: 80 µg/m³, above the limitDec 31: 77 µg/m³, above the limit
  • above the limit
  • below the limit
  • too few readings for the day
  • no PM10 data in the EEA database
Days above the limit with values (67)
  1. Jan 1 67
  2. Jan 5 64
  3. Jan 13 64
  4. Jan 14 95
  5. Jan 15 134
  6. Jan 16 61
  7. Jan 17 84
  8. Jan 21 111
  9. Jan 22 163
  10. Jan 23 206
  11. Jan 24 135
  12. Jan 25 183
  13. Jan 26 96
  14. Jan 27 92
  15. Jan 29 99
  16. Jan 30 114
  17. Jan 31 139
  18. Feb 1 140
  19. Feb 2 121
  20. Feb 3 106
  21. Feb 4 111
  22. Feb 5 126
  23. Feb 6 74
  24. Feb 7 83
  25. Feb 8 55
  26. Feb 15 61
  27. Feb 16 83
  28. Feb 17 73
  29. Feb 18 55
  30. Feb 19 58
  31. Feb 21 53
  32. Mar 27 86
  33. Apr 1 56
  34. Jun 22 53
  35. Oct 23 50
  36. Oct 24 60
  37. Oct 25 59
  38. Oct 30 51
  39. Oct 31 53
  40. Nov 1 53
  41. Nov 2 56
  42. Nov 3 68
  43. Nov 4 55
  44. Nov 5 65
  45. Nov 6 79
  46. Nov 7 62
  47. Nov 11 58
  48. Nov 16 57
  49. Nov 17 88
  50. Nov 18 115
  51. Nov 19 102
  52. Nov 24 75
  53. Nov 25 93
  54. Nov 26 124
  55. Nov 27 131
  56. Nov 28 129
  57. Dec 14 74
  58. Dec 15 52
  59. Dec 16 93
  60. Dec 17 104
  61. Dec 18 92
  62. Dec 19 80
  63. Dec 27 76
  64. Dec 28 66
  65. Dec 29 60
  66. Dec 30 80
  67. Dec 31 77

Values in µg/m³, limit 50 µg/m³.

Months of 2024

MonthDays above 50Highest dayNo readings
January17 above the number allowed2060
February14 above the number allowed1400
March1 above the number allowed860
April1 above the number allowed560
May0200
June1 above the number allowed530
July0330
August0300
September0320
October5 above the number allowed600
November17 above the number allowed1310
December11 above the number allowed1040

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 127 µg/m³, latest 127 µg/m³ (20:00)050100150ThuFriSatSunMonTueWedlatest 127 (20:00)
measuredmodel estimate, not counted
Last 7 days, every hour: PM10 in µg/m³
Values as a table
Hour toµg/m³Note
Wednesday, 10/7
21:0056model estimate, not counted
20:00126.7
19:0074.3
18:0053.6
17:0035.6
16:0029.5
15:0023.7
14:0029.3
13:0031.1
12:0043.2
11:0061.3
10:0076.8
09:0068
08:0043
07:0035.4
06:0045.9
05:0041
04:0037.2
03:0038.9
02:0045.2
01:0052.2
Tuesday, 10/6
00:0056.6
23:0063.5
22:0074.6
21:0071
20:0094.2
19:0076.1
18:0039.2
17:0029.9
16:0024.5
15:0031.9
14:0049.1
13:0037.3
12:0034.4
11:0036.7
10:0051.3
09:0060.2
08:0033.8
07:0028.2
06:0026.9
05:0032
04:0028.1
03:0031.6
02:0032.7
01:0042.3
Monday, 10/5
00:0046.3
23:0046.7
22:0052.7
21:0087.2
20:00105.2
19:0083.4
18:0044.8
17:0028.7
16:0019.7
15:0019.4
14:0030.2
13:0026.4
12:0017.2
11:0026.2
10:0036.7
09:0039.5
08:0026
07:0024.3
06:0023
05:0022.5
04:0022.3
03:0026.5
02:0031.7
01:0033.9
Sunday, 10/4
00:0039.9
23:0051.1
22:0057.8
21:0093.2
20:0067.9
19:0068.4
18:0025.4
17:0036.9
16:0010.6
15:0011.1
14:0014.3
13:0017.6
12:0017.3
11:0019.3
10:0024.2
09:0022.2
08:0019.7
07:0017.3
06:0016.8
05:0017
04:0020.6
03:0020.9
02:0025.3
01:0030.3
Saturday, 10/3
00:0032.7
23:0041.5
22:0055.6
21:0073.5
20:0068.4
19:0043.9
18:0025.3
17:0099.5
16:0020
15:0012.3
14:0015.8
13:0019.5
12:0021.8
11:0021.3
10:0029.3
09:0025.4
08:0020.2
07:0017.3
06:0018.8
05:0023.8
04:0020.8
03:0019.3
02:0027.1
01:0030
Friday, 10/2
00:0038.2
23:0050.4
22:0058.5
21:0050.1
20:0045.2
19:0021.3
18:0014.1
17:0023.2
16:0012.6
15:0020.1
14:0042.6
13:0035.2
12:0035.4
11:0030.8
10:0024.8
09:0023
08:0020.9
07:0015.6
06:0015.5
05:0017.8
04:0017.8
03:0018.3
02:0019.3
01:0023.8
Thursday, 10/1
00:0029.7
23:0034.9
22:0041.9
21:0054.6
20:0054
19:0037.3
18:0020.7
17:0015.5
16:0013.7
15:0015.3
14:0029
13:0026.9
12:0044.6
11:0032.9
10:0046.4
09:0023.9
08:0024.1
07:0017.6
06:0020.4
05:0020.7
04:0018.8
03:0018.1
02:0019.2
01:0021.7
Wednesday, 9/30
00:0031
Last 30 days, daily average: PM10 in µg/m³highest 45 µg/m³, latest 45 µg/m³02040609/99/169/239/30highest 45
too few readingslegal daily limit, 50 µg/m³no data from the station
Last 30 days, daily average: PM10 in µg/m³
Values as a table
Dayµg/m³Note
Tue, 10/645.3provisional
Mon, 10/538.4provisional
Sun, 10/431provisional
Sat, 10/332.6provisional
Fri, 10/228.1provisional
Thu, 10/128.4provisional
Wed, 9/3027.8provisional
Tue, 9/2928.5provisional
Mon, 9/2827provisional
Sun, 9/2728.9provisional
Sat, 9/2627.5provisional
Fri, 9/2514.9provisional
Thu, 9/2423.1provisional
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
Mon, 9/7no data from the station
Last 12 months, monthly average: PM10 in µg/m³highest 133 µg/m³, latest 34 µg/m³050100150DecFebAprJunAugOcthighest 133latest 34
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 far3422.2measured in 100 % of hours · provisional · year before: same days
September 2026too few readings24.9measured in 30 % of hours · provisional · 20 days without data from the station
August 202630.323measured in 97 % of hours · provisional
July 202620.921.9measured in 94 % of hours · provisional
June 202623.128.9measured in 93 % of hours · provisional · 1 day without data from the station
May 202620.117measured in 77 % of hours · provisional
April 202634.226.3measured in 75 % of hours · provisional · 4 days without data from the station
March 202653.744.5measured in 100 % of hours · provisional
February 202658.791.9measured in 100 % of hours · provisional
January 2026132.898measured in 88 % of hours · provisional · 2 days without data from the station
December 202575.946.2measured in 100 % of hours · verified
November 202565.763.5measured 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)≥ 57 above the number allowed104 above the number allowed67 above the number allowed
Days above 150 µg/m³ (warning threshold FBiH)≥ 9 above the number allowed12 above the number allowed3 above the number allowed
Days above 300 µg/m³ (alert threshold FBiH)≥ 2 above the number allowed00
Annual average, µg/m³ (legal limit 40)too few45.9 above the number allowed35.8¹
Highest daily average, µg/m³378January 23299January 21206January 23
Highest hourly value, µg/m³504January 23508December 18300January 23
Hours measured84 %99 %86 %
Days without any reading from the station2700

* 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.

¹ Fewer than 90 % of the hours were measured, so we do not compare this average with the limit.

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 2024 there were 82 such days.
  • WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2024 there were 82 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 2024

DayAverageTimes the limit
Jan 23, 20242064.1 ×
Jan 25, 20241833.7 ×
Jan 22, 20241633.3 ×
Feb 1, 20241402.8 ×
Jan 31, 20241392.8 ×

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: 36

8 outages, 853 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

FromToDuration
Sep 1, 2026 09:00Sep 22, 2026 09:0021 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). 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

samoEKO is a brand of samoLabs, Juelich.