Air at the Trebinje station

Trebinje, Republika Srpska

Network: Republic Hydrometeorological Institute of Republic of Srpska · Station code: BA0063A

This year, up to yesterday (October 6)

57 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.

In 2025: 21 days above the limit, the target value allows 25 as a three-year average.

11 days

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

35 days are allowed in the whole year.

Worst day: July 28, 2026, O₃ 205 µg/m³ as a daily average, 1.7 times the limit.

Daily average for 272 of 279 days · data for 2026 not yet finally verified · Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

All figures by year and month

No data has arrived from this station since October 6, 2026 at 15:00

No reading for 32 hours.

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.

This station is one of 6 stations in Republika Srpska from which no data has been arriving since October 6, 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: October 6, 2026 at 15:00
Measured then: NO₂ 5.1 µg/m³, O₃ 106 µg/m³, PM10 14.3 µg/m³, PM2.5 8.4 µg/m³, SO₂ 5.7 µg/m³

All outages of this station

Nearest station measuring now: Dubrovnik, Croatia, about 22 km away.

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

Go to that station

How the air is changing

Over the last seven days there was more PM10, PM2.5, O₃, and SO₂ in the air than the week before.

PM10: average 16 µg/m³, week before 8 µg/m³
PM2.5: average 10.6 µg/m³, week before 5 µg/m³
NO₂: average 5.9 µg/m³, week before 5.7 µg/m³
O₃: average 72.5 µg/m³, week before 61.9 µg/m³
SO₂: average 7 µg/m³, week before 5.2 µg/m³

Last month there was more SO₂ and less PM10, PM2.5, NO₂, and O₃ in the air than the month before.

PM10: average 23 µg/m³, month before 32.3 µg/m³
PM2.5: average 16.3 µg/m³, month before 21.8 µg/m³
NO₂: average 6.2 µg/m³, month before 7.4 µg/m³
O₃: average 80.7 µg/m³, month before 105.6 µg/m³
SO₂: average 5.1 µg/m³, month before 2.9 µg/m³

Show

Particulate matter PM10

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

Last 7 daysµg/m³

measured in 95 % of hours · provisional

19.6

Last 30 daysµg/m³

measured in 99 % of hours · provisional

15.5

Last 12 monthsµg/m³

measured in 99 % of hours · provisional

Days in 2023: PM10, daily average above 50 µg/m³

No measured day above the limit.

above the limit
below the limit
too few readings for the day
no PM10 data in the EEA database

Months of 2023

Month	Average	Highest day
January	8	23
February	11	30
March	7	20
April	6	12
May	6	12
June	too few	9
July	too few	23
August	16	32
September	12	37
October	9	22
November	6	10
December	12	28

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.

measuredmodel estimate, not counted

Last 7 days, every hour: PM10 in µg/m³

Values as a table

Hour to	µg/m³	Note
Wednesday, 10/7
22:00	16	model estimate, not counted
21:00	15	model estimate, not counted
20:00	16	model estimate, not counted
19:00	15	model estimate, not counted
18:00	12	model estimate, not counted
17:00	11	model estimate, not counted
16:00	11	model estimate, not counted
15:00	11	model estimate, not counted
14:00	12	model estimate, not counted
13:00	12	model estimate, not counted
12:00	13	model estimate, not counted
11:00	15	model estimate, not counted
10:00	19	model estimate, not counted
09:00	32	model estimate, not counted
08:00	33	model estimate, not counted
07:00	35	model estimate, not counted
06:00	37	model estimate, not counted
05:00	37	model estimate, not counted
04:00	30	model estimate, not counted
03:00	28	model estimate, not counted
02:00	26	model estimate, not counted
01:00	26	model estimate, not counted
Tuesday, 10/6
00:00	26	model estimate, not counted
23:00	26	model estimate, not counted
22:00	26	model estimate, not counted
21:00	26	model estimate, not counted
20:00	26	model estimate, not counted
19:00	26	model estimate, not counted
18:00	26	model estimate, not counted
17:00	26	model estimate, not counted
16:00	26	model estimate, not counted
15:00	14.3
14:00	17.3
13:00	30.5
12:00	56.3
11:00	58.8
10:00	48.1
09:00	38.9
08:00	30.2
07:00	20.8
06:00	18.6
05:00	16.7
04:00	16.3
03:00	15.3
02:00	14.9
01:00	16.3
Monday, 10/5
00:00	13.9
23:00	13.7
22:00	13.1
21:00	15.7
20:00	19.5
19:00	15.8
18:00	18.4
17:00	15.6
16:00	13
15:00	14
14:00	17.9
13:00	22
12:00	49
11:00	45.3
10:00	32.9
09:00	27.5
08:00	25.1
07:00	20.3
06:00	17.1
05:00	15.5
04:00	15.1
03:00	13.5
02:00	12.2
01:00	12.2
Sunday, 10/4
00:00	12.6
23:00	12.9
22:00	12.9
21:00	16.2
20:00	17.8
19:00	21.8
18:00	14.8
17:00	16.2
16:00	19.4
15:00	20
14:00	23.3
13:00	33.2
12:00	53.6
11:00	44.9
10:00	34.8
09:00	25.8
08:00	23.2
07:00	19.6
06:00	15.9
05:00	17.1
04:00	15.9
03:00	13.4
02:00	13.1
01:00	14.2
Saturday, 10/3
00:00	11.5
23:00	11
22:00	10.7
21:00	14.4
20:00	15.2
19:00	14.2
18:00	11.8
17:00	11.2
16:00	10
15:00	10.6
14:00	8.2
13:00	8.2
12:00	8.9
11:00	11.7
10:00	11.3
09:00	11
08:00	11.8
07:00	11.1
06:00	8.4
05:00	8.7
04:00	8.7
03:00	9.5
02:00	9.9
01:00	10.4
Friday, 10/2
00:00	11.7
23:00	12.5
22:00	14.3
21:00	13.5
20:00	17.3
19:00	14.9
18:00	14.3
17:00	13.1
16:00	13.2
15:00	12.7
14:00	13.1
13:00	16.4
12:00	13.2
11:00	14
10:00	13.9
09:00	15
08:00	13.4
07:00	11.6
06:00	12.7
05:00	10.9
04:00	9.8
03:00	8.4
02:00	7.5
01:00	7.9
Thursday, 10/1
00:00	8.8
23:00	9.4
22:00	12.7
21:00	16.1
20:00	21.6
19:00	16.6
18:00	14.7
17:00	13.4
16:00	10.8
15:00	12.1
14:00	13.7
13:00	13.4
12:00	12
11:00	10.7
10:00	11.7
09:00	13.5
08:00	13.3
07:00	11.7
06:00	11
05:00	9.9
04:00	9.7
03:00	9.6
02:00	9.5
01:00	9.2

day above the limittoo few readingslegal daily limit, 50 µg/m³

Last 30 days, daily average: PM10 in µg/m³ · 3 days above the limit

Values as a table

Day	µg/m³	Note
Tue, 10/6		too few readings
Mon, 10/5	19.9	provisional
Sun, 10/4	21.4	provisional
Sat, 10/3	10.8	provisional
Fri, 10/2	12.7	provisional
Thu, 10/1	12.3	provisional
Wed, 9/30	11.6	provisional
Tue, 9/29	11.2	provisional
Mon, 9/28	9.8	provisional
Sun, 9/27	6.6	provisional
Sat, 9/26	6.9	provisional
Fri, 9/25	6	provisional
Thu, 9/24	9.5	provisional
Wed, 9/23	5.9	provisional
Tue, 9/22	8.3	provisional
Mon, 9/21	14.7	provisional
Sun, 9/20	13.2	provisional
Sat, 9/19	10.2	provisional
Fri, 9/18	10.1	provisional
Thu, 9/17	8.5	provisional
Wed, 9/16	11.2	provisional
Tue, 9/15	12.9	provisional
Mon, 9/14	10.7	provisional
Sun, 9/13	10.4	provisional
Sat, 9/12	11.6	provisional
Fri, 9/11	22.8	provisional
Thu, 9/10	39.6	provisional
Wed, 9/9	56	above the limit · provisional
Tue, 9/8	98.5	above the limit · provisional
Mon, 9/7	79.2	above the limit · provisional

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

Month	µg/m³	a year earlier	Note
October 2026 so far	16.8	5.8	measured in 94 % of hours · provisional · year before: same days
September 2026	23	10.6	measured in 100 % of hours · provisional
August 2026	32.3	16.6	measured in 100 % of hours · provisional
July 2026	12.7	19.2	measured in 90 % of hours · provisional · 1 day without data from the station
June 2026	12.8	19	measured in 99 % of hours · provisional
May 2026	11.1	10.1	measured in 100 % of hours · provisional
April 2026	13.9	11.4	measured in 100 % of hours · provisional
March 2026	16.9	too few readings	measured in 100 % of hours · provisional
February 2026	10.3		measured in 100 % of hours · provisional
January 2026	15.5		measured in 100 % of hours · provisional
December 2025	14.5		measured in 100 % of hours · verified
November 2025	10.6		measured in 100 % of hours · verified

PM10 by year

Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

Measure	2026*	2025	2023
Days above 50 µg/m³ (allowed 35)	11	≥ 1²	0
Annual average, µg/m³ (legal limit 40)	16.6*	too few	9.5
Highest daily average, µg/m³	98September 8	56July 9	37September 23
Highest hourly value, µg/m³	285September 8	235July 9	133December 18
Hours measured	99 %	79 %	94 %
Days without any reading from the station	1	0	0

* 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.

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.

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 2023 there were 0 such days.
WHO 2021: daily 45 µg/m³, at most three to four days a year. In 2023 there were 0 such days.
EU from 2030: annual average 20 µg/m³. Average in 2023: 9 µg/m³.
WHO 2021: annual average 15 µg/m³. Average in 2023: 9 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.

Particulate matter PM2.5

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

10.6

Last 7 daysµg/m³

measured in 95 % of hours · provisional

14.4

Last 30 daysµg/m³

measured in 99 % of hours · provisional

10.4

Last 12 monthsµg/m³

measured in 99 % of hours · provisional

Months of 2023

Month	Average	Highest day
January	too few	9
February	8	14
March	5	10
April	4	8
May	4	6
June	too few	6
July	too few	16
August	12	24
September	6	13
October	5	12
November	4	7
December	10	25

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.

measured

Last 7 days, every hour: PM2.5 in µg/m³

Values as a table

Hour to	µg/m³	Note
Tuesday, 10/6
15:00	8.4
14:00	11.1
13:00	20.6
12:00	49
11:00	53
10:00	41.9
09:00	33.9
08:00	25
07:00	17.2
06:00	13.8
05:00	12.3
04:00	11.5
03:00	10.9
02:00	10.7
01:00	10.4
Monday, 10/5
00:00	9.4
23:00	9.4
22:00	9.3
21:00	9.7
20:00	12.1
19:00	9.8
18:00	10.9
17:00	8.3
16:00	7.4
15:00	7.9
14:00	11.9
13:00	15.4
12:00	43.4
11:00	40.2
10:00	27.3
09:00	23.5
08:00	21.7
07:00	16.7
06:00	14.2
05:00	12.7
04:00	12.1
03:00	10.4
02:00	9.7
01:00	9.5
Sunday, 10/4
00:00	9.4
23:00	9.7
22:00	9.9
21:00	10.7
20:00	11.2
19:00	15
18:00	8.9
17:00	11.1
16:00	12.5
15:00	13.9
14:00	17.2
13:00	26.8
12:00	47.2
11:00	40
10:00	30.9
09:00	20.9
08:00	18.5
07:00	15.4
06:00	12.4
05:00	13.7
04:00	12.2
03:00	10.1
02:00	9.1
01:00	9.6
Saturday, 10/3
00:00	7
23:00	6.8
22:00	6.6
21:00	8.4
20:00	8.4
19:00	7.3
18:00	6.2
17:00	5.8
16:00	5.2
15:00	4.4
14:00	3.6
13:00	4.4
12:00	4.8
11:00	6
10:00	5.8
09:00	5.7
08:00	5.6
07:00	5.4
06:00	5
05:00	5
04:00	5.2
03:00	5
02:00	5.4
01:00	6.7
Friday, 10/2
00:00	6.4
23:00	6.3
22:00	6.8
21:00	7.9
20:00	8.7
19:00	6.6
18:00	6.6
17:00	6.3
16:00	6.1
15:00	6.2
14:00	5
13:00	5.6
12:00	5.4
11:00	5.7
10:00	5.8
09:00	6.5
08:00	6.7
07:00	6.1
06:00	6
05:00	5.6
04:00	5.3
03:00	4.6
02:00	4.2
01:00	4
Thursday, 10/1
00:00	4.5
23:00	5.9
22:00	7.7
21:00	9.3
20:00	8.9
19:00	7.5
18:00	6.8
17:00	6.6
16:00	6.2
15:00	6.6
14:00	6
13:00	5.9
12:00	5.6
11:00	5.8
10:00	6
09:00	6.5
08:00	7.2
07:00	6.4
06:00	6.2
05:00	5.7
04:00	5.4
03:00	5.4
02:00	5.3
01:00	5.5

too few readings

Last 30 days, daily average: PM2.5 in µg/m³

Values as a table

Day	µg/m³	Note
Tue, 10/6		too few readings
Mon, 10/5	15.1	provisional
Sun, 10/4	16.5	provisional
Sat, 10/3	5.8	provisional
Fri, 10/2	6	provisional
Thu, 10/1	6.4	provisional
Wed, 9/30	6.4	provisional
Tue, 9/29	6.6	provisional
Mon, 9/28	6.1	provisional
Sun, 9/27	4.5	provisional
Sat, 9/26	4.7	provisional
Fri, 9/25	4.3	provisional
Thu, 9/24	5.7	provisional
Wed, 9/23	3	provisional
Tue, 9/22	3.1	provisional
Mon, 9/21	10.2	provisional
Sun, 9/20	8.9	provisional
Sat, 9/19	5.6	provisional
Fri, 9/18	6.6	provisional
Thu, 9/17	5.7	provisional
Wed, 9/16	7.6	provisional
Tue, 9/15	7.2	provisional
Mon, 9/14	6.4	provisional
Sun, 9/13	6.6	provisional
Sat, 9/12	6.1	provisional
Fri, 9/11	15.4	provisional
Thu, 9/10	30.9	provisional
Wed, 9/9	48	provisional
Tue, 9/8	85.2	provisional
Mon, 9/7	68.4	provisional

Last 12 monthsthis month so fara year earlierlegal annual limit, 25 µg/m³month with days without data from the station

Last 12 months, monthly average: PM2.5 in µg/m³

Values as a table

Month	µg/m³	a year earlier	Note
October 2026 so far	11.3	3.5	measured in 94 % of hours · provisional · year before: same days
September 2026	16.3	5.6	measured in 100 % of hours · provisional
August 2026	21.8	10.5	measured in 100 % of hours · provisional
July 2026	7.2	11.8	measured in 90 % of hours · provisional · 1 day without data from the station
June 2026	7.8	11.2	measured in 99 % of hours · provisional
May 2026	5.8	5.7	measured in 100 % of hours · provisional
April 2026	7.9	6.3	measured in 100 % of hours · provisional
March 2026	12.2	too few readings	measured in 100 % of hours · provisional
February 2026	7.5		measured in 100 % of hours · provisional
January 2026	11		measured in 100 % of hours · provisional
December 2025	11.6		measured in 100 % of hours · verified
November 2025	7.2		measured in 100 % of hours · verified

PM2.5 by year

Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

Measure	2026*	2025	2023
Annual average, µg/m³ (legal limit 25)	10.9*	too few	too few
Highest daily average, µg/m³	85September 8	49July 9	25December 29
Highest hourly value, µg/m³	252September 8	203July 9	125December 18
Hours measured	99 %	79 %	87 %
Days without any reading from the station	1	0	0

* 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.

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

Compared with the new EU rules and the WHO recommendation

EU from 2030: daily 25 µg/m³, 18 days allowed. In 2023 there were 0 such days.
WHO 2021: daily 15 µg/m³, at most three to four days a year. In 2023 there were 15 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.

Nitrogen dioxide NO₂

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

5.9

Last 7 daysµg/m³

measured in 95 % of hours · provisional

5.9

Last 30 daysµg/m³

measured in 99 % of hours · provisional

6.8

Last 12 monthsµg/m³

measured in 97 % of hours · provisional

Days in 2023: NO₂, daily average above 85 µg/m³

No measured day above the limit.

above the limit
below the limit
too few readings for the day
no NO₂ data in the EEA database

Months of 2023

Month	Days above 85	Hours above 150	Average	Highest day
January	0	0	5	10
February	0	0	7	16
March	0	0	6	10
April	0	0	5	8
May	0	0	too few	9
June
July
August	0	0	too few	7
September	0	0	5	8
October	0	0	5	7
November	0	0	6	10
December	0	0	9	16

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.

measuredmodel estimate, not counted

Last 7 days, every hour: NO₂ in µg/m³

Values as a table

Hour to	µg/m³	Note
Wednesday, 10/7
22:00	4	model estimate, not counted
21:00	4	model estimate, not counted
20:00	4	model estimate, not counted
19:00	4	model estimate, not counted
18:00	4	model estimate, not counted
17:00	3	model estimate, not counted
16:00	2	model estimate, not counted
15:00	2	model estimate, not counted
14:00	2	model estimate, not counted
13:00	2	model estimate, not counted
12:00	3	model estimate, not counted
11:00	3	model estimate, not counted
10:00	4	model estimate, not counted
09:00	6	model estimate, not counted
08:00	9	model estimate, not counted
07:00	7	model estimate, not counted
06:00	5	model estimate, not counted
05:00	4	model estimate, not counted
04:00	3	model estimate, not counted
03:00	3	model estimate, not counted
02:00	3	model estimate, not counted
01:00	4	model estimate, not counted
Tuesday, 10/6
00:00	4	model estimate, not counted
23:00	4	model estimate, not counted
22:00	4	model estimate, not counted
21:00	4	model estimate, not counted
20:00	4	model estimate, not counted
19:00	4	model estimate, not counted
18:00	4	model estimate, not counted
17:00	4	model estimate, not counted
16:00	4	model estimate, not counted
15:00	5.1
14:00	4.9
13:00	4.8
12:00	9.3
11:00	10
10:00	7.5
09:00	7.3
08:00	7.5
07:00	4
06:00	2.9
05:00	2.9
04:00	2.8
03:00	2.7
02:00	2.7
01:00	3
Monday, 10/5
00:00	4
23:00	6.1
22:00	5.7
21:00	9.3
20:00	22.3
19:00	17.8
18:00	8.8
17:00	4.9
16:00	4.7
15:00	4.3
14:00	5.1
13:00	6.1
12:00	6.6
11:00	6.9
10:00	5.4
09:00	4.9
08:00	5.4
07:00	4.6
06:00	2.7
05:00	2.3
04:00	2.6
03:00	2.4
02:00	2.8
01:00	2.9
Sunday, 10/4
00:00	3.3
23:00	3.9
22:00	6.7
21:00	13.3
20:00	20.8
19:00	14.2
18:00	6.9
17:00	5
16:00	5.6
15:00	5.6
14:00	5.4
13:00	5.5
12:00	6.4
11:00	5.9
10:00	4.5
09:00	4.3
08:00	4
07:00	3.5
06:00	2.9
05:00	2.6
04:00	3
03:00	2.7
02:00	2.8
01:00	2.6
Saturday, 10/3
00:00	2.9
23:00	4
22:00	6.1
21:00	8.6
20:00	16.2
19:00	6.6
18:00	4.7
17:00	3.9
16:00	3.6
15:00	5
14:00	4
13:00	5.3
12:00	5
11:00	5
10:00	5.7
09:00	6.6
08:00	5.4
07:00	4.9
06:00	2.5
05:00	2.3
04:00	2.6
03:00	2.3
02:00	2.4
01:00	2.9
Friday, 10/2
00:00	6.2
23:00	6
22:00	8.5
21:00	7.8
20:00	18.7
19:00	9.5
18:00	6
17:00	6
16:00	6.6
15:00	5
14:00	5.8
13:00	7.9
12:00	7.3
11:00	5.7
10:00	5.6
09:00	7.1
08:00	6.6
07:00	4.4
06:00	3.9
05:00	2.9
04:00	2.6
03:00	2.3
02:00	2.9
01:00	2.8
Thursday, 10/1
00:00	3.6
23:00	4.8
22:00	5.3
21:00	15.4
20:00	19.8
19:00	9.2
18:00	5.7
17:00	4.7
16:00	3.6
15:00	5
14:00	3.8
13:00	6.1
12:00	5.5
11:00	4
10:00	4.2
09:00	5
08:00	6.2
07:00	4.1
06:00	3.5
05:00	2.2
04:00	1.6
03:00	2.1
02:00	2.1
01:00	3.8

too few readings

Last 30 days, daily average: NO₂ in µg/m³

Values as a table

Day	µg/m³	Note
Tue, 10/6		too few readings
Mon, 10/5	6.2	provisional
Sun, 10/4	5.9	provisional
Sat, 10/3	4.9	provisional
Fri, 10/2	6.2	provisional
Thu, 10/1	5.5	provisional
Wed, 9/30	6.9	provisional
Tue, 9/29	7.3	provisional
Mon, 9/28	7.3	provisional
Sun, 9/27	4.7	provisional
Sat, 9/26	4.6	provisional
Fri, 9/25	4.6	provisional
Thu, 9/24	7.9	provisional
Wed, 9/23	3.4	provisional
Tue, 9/22	3.1	provisional
Mon, 9/21	4.7	provisional
Sun, 9/20	6.8	provisional
Sat, 9/19	6.4	provisional
Fri, 9/18	5	provisional
Thu, 9/17	5.4	provisional
Wed, 9/16	5.2	provisional
Tue, 9/15	6.4	provisional
Mon, 9/14	6	provisional
Sun, 9/13	4.5	provisional
Sat, 9/12	5.5	provisional
Fri, 9/11	5.3	provisional
Thu, 9/10	8.7	provisional
Wed, 9/9	7	provisional
Tue, 9/8	7.9	provisional
Mon, 9/7	9.1	provisional

Last 12 monthsthis month so fara year earliermonth with days without data from the station

Last 12 months, monthly average: NO₂ in µg/m³

Values as a table

Month	µg/m³	a year earlier	Note
October 2026 so far	5.7	6.3	measured in 94 % of hours · provisional · year before: same days
September 2026	6.2	7.1	measured in 100 % of hours · provisional
August 2026	7.4	8.1	measured in 100 % of hours · provisional
July 2026	5.1	7.5	measured in 90 % of hours · provisional · 1 day without data from the station
June 2026	4.6	6.4	measured in 99 % of hours · provisional
May 2026	4.8	6.4	measured in 100 % of hours · provisional
April 2026	5.6	7.1	measured in 100 % of hours · provisional
March 2026	7.6	8.5	measured in 100 % of hours · provisional
February 2026	7.8	10.7	measured in 100 % of hours · provisional
January 2026	7.7	10.3	measured in 100 % of hours · provisional
December 2025	8	9.8	measured in 100 % of hours · verified
November 2025	9.7	6.8	measured in 79 % of hours · verified

NO₂ by year

Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

Measure	2026*	2025	2024	2023
Days above 85 µg/m³ (none allowed)	0	0	0²	0²
Hours above 150 µg/m³ (allowed 18)	0	0	0²	0²
Hours above 400 µg/m³, three hours in a row (concentration dangerous to health)	0	0	0	0
Annual average, µg/m³ (legal limit 40)	6.3*	8.1	5.8¹	too few
Highest daily average, µg/m³	16January 14	18February 7	17December 17	16February 2
Highest hourly value, µg/m³	61January 20	73August 15	52January 24	63February 17
Hours measured	99 %	98 %	87 %	75 %
Days without any reading from the station	1	0	37	0

* 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.

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

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 concentration dangerous to health: every such hour is in red.

The column for 2023 is shown on wider screens.

Compared with the new EU rules and the WHO recommendation

EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there were 0 such days.
WHO 2021: daily 25 µg/m³, at most three to four days a year. In 2023 there were 0 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.

Ozone O₃

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

72.5

Last 7 daysµg/m³

measured in 91 % of hours · provisional

74.1

Last 30 daysµg/m³

measured in 95 % of hours · provisional

44.7

Last 12 monthsµg/m³

measured in 94 % of hours · provisional

Days in 2023: O₃, 8-hour average above 120 µg/m³

25 days above the limit.

above the limit
below the limit
too few readings for the day
no O₃ data in the EEA database

Days above the limit with values (25)

Aug 10 123
Aug 11 128
Aug 12 132
Aug 13 139
Aug 14 133
Aug 15 127
Aug 16 135
Aug 17 142
Aug 18 142
Aug 19 135
Aug 20 121
Aug 21 136
Aug 22 149
Aug 23 146
Aug 24 153
Aug 25 154
Aug 26 145
Aug 27 142
Aug 28 155
Aug 29 150
Sep 10 124
Sep 11 127
Sep 12 131
Sep 13 124
Sep 14 123

Values in µg/m³, limit 120 µg/m³.

Months of 2023

Month	Days above 120	Average	Highest 8 h
January	0	49	74
February	0	58	80
March	0	too few	80
April
May
June
July
August	20 above the number allowed	too few	155
September	5 above the number allowed	93	131
October	0	73	107
November	0	61	99
December	0	55	104

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.

measuredmodel estimate, not counted

Last 7 days, every hour: O₃ in µg/m³

Values as a table

Hour to	µg/m³	Note
Wednesday, 10/7
22:00	62	model estimate, not counted
21:00	66	model estimate, not counted
20:00	69	model estimate, not counted
19:00	80	model estimate, not counted
18:00	87	model estimate, not counted
17:00	92	model estimate, not counted
16:00	93	model estimate, not counted
15:00	92	model estimate, not counted
14:00	93	model estimate, not counted
13:00	92	model estimate, not counted
12:00	91	model estimate, not counted
11:00	87	model estimate, not counted
10:00	81	model estimate, not counted
09:00	64	model estimate, not counted
08:00	47	model estimate, not counted
07:00	48	model estimate, not counted
06:00	48	model estimate, not counted
05:00	49	model estimate, not counted
04:00	49	model estimate, not counted
03:00	50	model estimate, not counted
02:00	52	model estimate, not counted
01:00	52	model estimate, not counted
Tuesday, 10/6
00:00	52	model estimate, not counted
23:00	52	model estimate, not counted
22:00	52	model estimate, not counted
21:00	52	model estimate, not counted
20:00	52	model estimate, not counted
19:00	52	model estimate, not counted
18:00	52	model estimate, not counted
17:00	52	model estimate, not counted
16:00	52	model estimate, not counted
15:00	106
14:00	102.7
13:00	96.6
12:00	86.7
11:00	67.2
10:00	60.2
09:00	58.7
08:00	57
07:00	59.6
06:00	65.5
05:00	66.4
04:00	68.7
03:00	74.3
02:00	76.2
01:00	78.7
Monday, 10/5
00:00	77.2
22:00	79.7
21:00	77.6
20:00	69.8
19:00	82.2
18:00	94.9
17:00	103
16:00	103.7
15:00	105.1
14:00	98.1
13:00	96.1
12:00	74.2
11:00	57.9
10:00	57.6
09:00	54.3
08:00	54.5
07:00	53.7
06:00	61.9
05:00	63.7
04:00	64.3
03:00	68.2
02:00	69.9
01:00	73.2
Sunday, 10/4
00:00	73.9
22:00	70.1
21:00	67
20:00	68.7
19:00	86.5
18:00	97.8
17:00	103
16:00	108.4
15:00	101.2
14:00	93.9
13:00	88.7
12:00	75.4
11:00	57
10:00	52.8
09:00	52.1
08:00	50.7
07:00	49.2
06:00	54.9
05:00	53.7
04:00	54.4
03:00	56.9
02:00	62.1
01:00	65.9
Saturday, 10/3
00:00	65.3
22:00	61
21:00	64.5
20:00	65.8
19:00	85.2
18:00	94.6
17:00	94
16:00	96
15:00	93
14:00	89.2
13:00	86
12:00	80
11:00	73
10:00	68.7
09:00	62
08:00	66.7
07:00	67.7
06:00	72.6
05:00	74.4
04:00	71
03:00	75.1
02:00	72.7
01:00	66.4
Friday, 10/2
00:00	62.4
22:00	65.3
21:00	67.8
20:00	64
19:00	82
18:00	90.3
17:00	93.9
16:00	90.9
15:00	91.7
14:00	88.8
13:00	82.9
12:00	72.6
11:00	64.8
10:00	61
09:00	53
08:00	51.6
07:00	51.1
06:00	55.9
05:00	60.7
04:00	59.3
03:00	62.1
02:00	63.7
01:00	62.7
Thursday, 10/1
00:00	62.2
22:00	65
21:00	54.9
20:00	62.9
19:00	78.4
18:00	84.2
17:00	86.1
16:00	85.1
15:00	85.4
14:00	84.1
13:00	79.1
12:00	69.1
11:00	59.6
10:00	64.1
09:00	56.9
08:00	56.9
07:00	53.9
06:00	62.2
05:00	66.5
04:00	64.2
03:00	66.4
02:00	69.5
01:00	63.2

day above the limittoo few readingstarget value, 120 µg/m³

Last 30 days, highest 8-hour average of the day: O₃ in µg/m³ · 1 day above the limit

Values as a table

Day	µg/m³	Note
Tue, 10/6		too few readings
Mon, 10/5	94.7	provisional
Sun, 10/4	94.4	provisional
Sat, 10/3	89.7	provisional
Fri, 10/2	86.7	provisional
Thu, 10/1	81.4	provisional
Wed, 9/30	85.5	provisional
Tue, 9/29	92	provisional
Mon, 9/28	79.8	provisional
Sun, 9/27	69.9	provisional
Sat, 9/26	62.4	provisional
Fri, 9/25	60.7	provisional
Thu, 9/24	65.9	provisional
Wed, 9/23	69.8	provisional
Tue, 9/22	77.2	provisional
Mon, 9/21	92.1	provisional
Sun, 9/20	103.3	provisional
Sat, 9/19	74.3	provisional
Fri, 9/18	92.3	provisional
Thu, 9/17	92	provisional
Wed, 9/16	86.9	provisional
Tue, 9/15	92	provisional
Mon, 9/14	103.8	provisional
Sun, 9/13	97.2	provisional
Sat, 9/12	91.7	provisional
Fri, 9/11	89.1	provisional
Thu, 9/10	114.4	provisional
Wed, 9/9	124.1	above the limit · provisional
Tue, 9/8	112.3	provisional
Mon, 9/7	114.3	provisional

Last 12 monthsthis month so fara year earliermonth with days without data from the station

Last 12 months, monthly average: O₃ in µg/m³

Values as a table

Month	µg/m³	a year earlier	Note
October 2026 so far	72.6	61.6	measured in 90 % of hours · provisional · year before: same days
September 2026	80.7	67.4	measured in 96 % of hours · provisional
August 2026	105.6	92.1	measured in 96 % of hours · provisional
July 2026	111.2	93.5	measured in 86 % of hours · provisional · 1 day without data from the station
June 2026	47.9	96.7	measured in 95 % of hours · provisional
May 2026	18	80.2	measured in 94 % of hours · provisional
April 2026	19.7	75	measured in 96 % of hours · provisional
March 2026	16.3	75.1	measured in 96 % of hours · provisional
February 2026	14.3	59.8	measured in 96 % of hours · provisional
January 2026	13.8	54.2	measured in 96 % of hours · provisional
December 2025	11.5	50	measured in 100 % of hours · verified
November 2025	42.9	53.5	measured in 79 % of hours · verified

O₃ by year

Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

Measure	2026*	2025	2024	2023
Days with 8-hour average above 120 µg/m³ (target value 25)	57	21	≥ 22²	≥ 25²
Annual average, µg/m³	47.7*	67.6	too few	too few
Highest 8-hour average, µg/m³	205July 28	146July 5	150July 1	155August 28
Hours measured	94 %	98 %	67 %	57 %
Days without any reading from the station	1	0	37	0

* 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.

The column for 2023 is shown on wider screens.

The worst days of 2023

Day	Highest 8 h	Times the limit
Aug 28, 2023	155	1.3 ×
Aug 25, 2023	154	1.3 ×
Aug 24, 2023	153	1.3 ×
Aug 29, 2023	150	1.2 ×
Aug 22, 2023	149	1.2 ×

Daily average in µg/m³, daily limit 120 µg/m³. Days with the same unverified value over many hours are not on this list.

Sulphur dioxide SO₂

no measurement

Now

too few readings

Last 24 hours

measured in 0 % of hours

Last 7 daysµg/m³

measured in 91 % of hours · provisional

5.6

Last 30 daysµg/m³

measured in 95 % of hours · provisional

8.8

Last 12 monthsµg/m³

measured in 94 % of hours · provisional

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

No measured day above the limit.

above the limit
below the limit
too few readings for the day
no SO₂ data in the EEA database

Months of 2023

Month	Days above 125	Hours above 350	Average	Highest day
January	0	0	21	39
February	0	0	24	39
March	0	0	21	28
April	0	0	25	53
May	0	0	22	29
June	0	0	22	31
July	0	0	22	25
August	0	0	10	38
September	0	0	4	11
October	0	0	5	13
November	0	0	too few	5
December

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.

measured

Last 7 days, every hour: SO₂ in µg/m³

Values as a table

Hour to	µg/m³	Note
Tuesday, 10/6
15:00	5.7
14:00	5.8
13:00	6.2
12:00	7.1
11:00	7.3
10:00	5.7
09:00	5.5
08:00	5.3
07:00	5.1
06:00	5.4
05:00	5.7
04:00	5.6
03:00	5.6
02:00	5.3
01:00	5.5
Monday, 10/5
00:00	5.5
22:00	5.6
21:00	5.6
20:00	5.8
19:00	5.9
18:00	6.3
17:00	6.1
16:00	5.8
15:00	5.7
14:00	6.1
13:00	5.8
12:00	6.1
11:00	5.8
10:00	5.9
09:00	5.6
08:00	5
07:00	5.2
06:00	5.3
05:00	5.5
04:00	5.6
03:00	5.9
02:00	5.6
01:00	5.7
Sunday, 10/4
00:00	6.2
22:00	6
21:00	6
20:00	5.9
19:00	6.8
18:00	6.9
17:00	7
16:00	7.3
15:00	8.6
14:00	11.1
13:00	14
12:00	19.9
11:00	9.2
10:00	7.1
09:00	10.2
08:00	7.9
07:00	7.2
06:00	7.6
05:00	7.5
04:00	7.7
03:00	7.3
02:00	8.3
01:00	6
Saturday, 10/3
00:00	5
22:00	4.9
21:00	4.9
20:00	4.8
19:00	4.7
18:00	5.1
17:00	5.6
16:00	6
15:00	7
14:00	8.8
13:00	8.1
12:00	8.9
11:00	11.6
10:00	12.2
09:00	9.3
08:00	9.8
07:00	9.5
06:00	5.5
05:00	6
04:00	7.5
03:00	8.3
02:00	5.7
01:00	4.4
Friday, 10/2
00:00	4.7
22:00	5.3
21:00	4.9
20:00	5
19:00	4.8
18:00	5.2
17:00	5.4
16:00	6
15:00	6.6
14:00	19.2
13:00	34.3
12:00	33.4
11:00	27.8
10:00	20
09:00	18.4
08:00	11
07:00	10.1
06:00	13.3
05:00	9.7
04:00	5.6
03:00	4.3
02:00	3.8
01:00	4
Thursday, 10/1
00:00	4.3
22:00	4.3
21:00	4.3
20:00	4.4
19:00	4.5
18:00	4.8
17:00	5.2
16:00	5.8
15:00	6
14:00	8.8
13:00	8.7
12:00	7
11:00	7.5
10:00	8.3
09:00	11.3
08:00	6.7
07:00	4.9
06:00	5.4
05:00	4.2
04:00	3.7
03:00	3.8
02:00	3.8
01:00	3.8

too few readings

Last 30 days, daily average: SO₂ in µg/m³

Values as a table

Day	µg/m³	Note
Tue, 10/6		too few readings
Mon, 10/5	5.7	provisional
Sun, 10/4	8.3	provisional
Sat, 10/3	7.1	provisional
Fri, 10/2	11.4	provisional
Thu, 10/1	5.7	provisional
Wed, 9/30	4.6	provisional
Tue, 9/29	7.3	provisional
Mon, 9/28	4.2	provisional
Sun, 9/27	3.5	provisional
Sat, 9/26	3.9	provisional
Fri, 9/25	3.7	provisional
Thu, 9/24	7.2	provisional
Wed, 9/23	6.4	provisional
Tue, 9/22	10.7	provisional
Mon, 9/21	9.8	provisional
Sun, 9/20	4.3	provisional
Sat, 9/19	2.2	provisional
Fri, 9/18	2.4	provisional
Thu, 9/17	2.6	provisional
Wed, 9/16	4.3	provisional
Tue, 9/15	12.2	provisional
Mon, 9/14	5.4	provisional
Sun, 9/13	8	provisional
Sat, 9/12	6	provisional
Fri, 9/11	2	provisional
Thu, 9/10	2.5	provisional
Wed, 9/9	2.6	provisional
Tue, 9/8	4.1	provisional
Mon, 9/7	4.5	provisional

Last 12 monthsthis month so fara year earlierlegal annual limit, 50 µg/m³month with days without data from the station

Last 12 months, monthly average: SO₂ in µg/m³

Values as a table

Month	µg/m³	a year earlier	Note
October 2026 so far	7.4	25.7	measured in 90 % of hours · provisional · year before: same days
September 2026	5.1	16	measured in 96 % of hours · provisional
August 2026	2.9	13.8	measured in 96 % of hours · provisional
July 2026	10.1	9.3	measured in 86 % of hours · provisional · 1 day without data from the station
June 2026	8	7.8	measured in 95 % of hours · provisional
May 2026	9.5	6.4	measured in 96 % of hours · provisional
April 2026	10	4.8	measured in 96 % of hours · provisional
March 2026	7.1	10.2	measured in 96 % of hours · provisional
February 2026	6	16.3	measured in 96 % of hours · provisional
January 2026	4.2	10.7	measured in 96 % of hours · provisional
December 2025	5.1		measured in 100 % of hours · verified
November 2025	18.9		measured in 79 % of hours · verified

SO₂ by year

Yardstick: limits in Republika Srpska (Uredba, Official Gazette RS 124/12, as given in the RHMZ RS report)

Measure	2026*	2025	2023
Days above 125 µg/m³ (allowed 3)	0	0	0²
Hours above 350 µg/m³ (allowed 24)	0	0	0²
Hours above 500 µg/m³, three hours in a row (concentration dangerous to health)	0	0	0
Annual average, µg/m³ (legal limit 50)	7*	11.7	too few
Highest daily average, µg/m³	27April 30	42September 30	53April 6
Highest hourly value, µg/m³	84April 30	100September 30	105April 6
Hours measured	95 %	98 %	88 %
Days without any reading from the station	1	0	0

* 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.

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 concentration dangerous to health: every such hour is in red.

Compared with the new EU rules and the WHO recommendation

EU from 2030: daily 50 µg/m³, 18 days allowed. In 2023 there was 1 such day.
WHO 2021: daily 40 µg/m³, at most three to four days a year. In 2023 there was 1 such day.

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

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: 3

2 outages, 65 hours in total in the last 12 months.

Timeline of outages from October 7, 2025 to today

From	To	Duration
Oct 6, 2026 15:00	still ongoing	32 hours
Jul 1, 2026 23:00	Jul 3, 2026 08:00	33 hours

Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.

Who is responsible

In Republika Srpska air quality is governed by the Air Protection Act (Official Gazette RS 124/11 and 46/17) and the Regulation on Air Quality Values (Official Gazette RS 124/12). The republic’s monitoring network is run by the Republic Hydrometeorological Institute (RHMZ RS), which publishes an air quality report every year.

We take the limit values from the RHMZ RS report for 2025, which cites the regulation. Unlike in the Federation of BiH, the hourly limit for nitrogen dioxide is 150 µg/m³, at most 18 times a year. As in the Federation, nitrogen dioxide also has a daily limit of 85 µg/m³ with no exceedance allowed. The regulation calls 500 µg/m³ of sulphur dioxide and 400 µg/m³ of nitrogen dioxide over three hours in a row a concentration dangerous to health.

We have not yet checked in the text of the law who in Republika Srpska must adopt a plan when a limit is exceeded, so we do not state it here.

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 Republic Hydrometeorological Institute of Republic of Srpska. 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 those of Republika Srpska (Uredba o vrijednostima kvaliteta vazduha, Official Gazette RS 124/12), as listed by RHMZ RS in its report for 2025. Unlike in the FBiH, the hourly limit for NO₂ is 150 µg/m³. 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

How to cite this page

Name samoEKO as the source and link to this page. The readings come from official stations, so please credit them too.

Source: samoEKO, Air quality, Trebinje station, https://samoeko.com/en/luft/stanica/BA0063A, accessed 7 October 2026. Readings: official stations, via the European Environment Agency (EEA). The level is calculated by samoEKO.

Rules for reuse

samoEKO is a brand of samoLabs, Juelich.