Air at the Otlica station
Ajdovščina, Slovenia
Network: Slovenian Environment Agency · Station code: SI0053A
This year, up to yesterday (October 6)
82 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: 63 days above the limit, the target value allows 25 as a three-year average.
Worst day: August 16, 2026, O₃ 173 µg/m³ as a daily average, 1.4 times the limit.
Daily average for 259 of 279 days · data for 2026 not yet finally verified · Yardstick: EU limits (Directive 2008/50/EC)
Fair
Air now · Measured at 19:00
Latest values
Latest value: 19:00
| Pollutant | Value | Level |
|---|---|---|
| O₃ | 93.3 µg/m³ | Fair |
How the air is changing
Over the last seven days there was more O₃ in the air than the week before.
- O₃: average 105.2 µg/m³, week before 87.6 µg/m³
Last month there was less O₃ in the air than the month before.
- O₃: average 89.4 µg/m³, month before 123.2 µg/m³
Ozone O₃
93.3
Nowµg/m³
Measured at 19:00
115.9
Last 24 hoursµg/m³
measured in 96 % of hours · provisional
105.2
Last 7 daysµg/m³
measured in 100 % of hours · provisional
90
Last 30 daysµg/m³
measured in 100 % of hours · provisional
92.6
Last 12 monthsµg/m³
measured in 93 % of hours · provisional
Days in 2025: O₃, 8-hour average above 120 µg/m³
63 days above the limit.
- above the limit
- below the limit
- too few readings for the day
Days above the limit with values (63)
- Apr 5 135
- Apr 11 134
- Apr 12 137
- Apr 13 136
- Apr 30 121
- May 1 129
- May 2 147
- May 3 148
- May 4 136
- May 26 120
- May 31 125
- Jun 1 134
- Jun 7 121
- Jun 8 121
- Jun 11 142
- Jun 12 140
- Jun 13 140
- Jun 14 148
- Jun 15 172
- Jun 16 166
- Jun 18 134
- Jun 19 156
- Jun 20 151
- Jun 21 122
- Jun 22 158
- Jun 23 183
- Jun 24 171
- Jun 25 175
- Jun 26 187
- Jun 27 156
- Jun 28 134
- Jun 30 162
- Jul 1 163
- Jul 2 138
- Jul 3 159
- Jul 4 140
- Jul 5 127
- Jul 6 142
- Jul 7 125
- Jul 12 128
- Jul 13 127
- Jul 14 134
- Jul 15 125
- Jul 18 122
- Jul 19 137
- Jul 20 130
- Jul 21 124
- Jul 24 120
- Aug 1 126
- Aug 11 136
- Aug 12 142
- Aug 13 155
- Aug 14 154
- Aug 15 144
- Aug 16 136
- Aug 17 130
- Aug 18 131
- Aug 19 142
- Aug 20 140
- Aug 21 122
- Aug 26 123
- Aug 27 123
- Sep 9 125
Values in µg/m³, limit 120 µg/m³.
Months of 2025
| Month | Days above 120 | Highest 8 h | No readings |
|---|---|---|---|
| January | 0 | 91 | 0 |
| February | 0 | 103 | 0 |
| March | 0 | 117 | 0 |
| April | 5 above the number allowed | 137 | 0 |
| May | 6 above the number allowed | 148 | 0 |
| June | 21 above the number allowed | 187 | 0 |
| July | 16 above the number allowed | 163 | 0 |
| August | 14 above the number allowed | 155 | 0 |
| September | 1 above the number allowed | 125 | 0 |
| October | 0 | 100 | 0 |
| November | 0 | 104 | 0 |
| December | 0 | 95 | 0 |
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.
Values as a table
| Hour to | µg/m³ | Note |
|---|---|---|
| Wednesday, 10/7 | ||
| 19:00 | 86 | |
| 18:00 | 90.5 | |
| 17:00 | 96.3 | |
| 16:00 | 105 | |
| 15:00 | 111.6 | |
| 14:00 | 110.1 | |
| 13:00 | 105.4 | |
| 12:00 | 114.9 | |
| 11:00 | 126.2 | |
| 10:00 | 133.1 | |
| 09:00 | 128.9 | |
| 08:00 | 116.5 | |
| 07:00 | 115 | |
| 06:00 | 116.5 | |
| 05:00 | 116 | |
| 04:00 | 114.3 | |
| 03:00 | 117.5 | |
| 02:00 | 128.2 | |
| 01:00 | 130.4 | |
| Tuesday, 10/6 | ||
| 00:00 | 131.7 | |
| 23:00 | 128.6 | |
| 22:00 | 125.7 | |
| 21:00 | 118.4 | |
| 20:00 | 111 | |
| 19:00 | 109.3 | |
| 18:00 | 123.9 | |
| 17:00 | 125.9 | |
| 16:00 | 115.8 | |
| 15:00 | 110.9 | |
| 14:00 | 109.9 | |
| 13:00 | 109.5 | |
| 12:00 | 106 | |
| 11:00 | 107.6 | |
| 10:00 | 108.3 | |
| 09:00 | 103.9 | |
| 08:00 | 101.8 | |
| 07:00 | 95.1 | |
| 06:00 | 88.9 | |
| 05:00 | 91.7 | |
| 04:00 | 99 | |
| 03:00 | 107.8 | |
| 02:00 | 108.3 | |
| 01:00 | 107.3 | |
| Monday, 10/5 | ||
| 00:00 | 105.7 | |
| 23:00 | 102.5 | |
| 22:00 | 102.5 | |
| 21:00 | 100.8 | |
| 20:00 | 100.1 | |
| 19:00 | 97.6 | |
| 18:00 | 104.6 | |
| 17:00 | 105.5 | |
| 16:00 | 102.1 | |
| 15:00 | 100.5 | |
| 14:00 | 103.4 | |
| 13:00 | 107.6 | |
| 12:00 | 107.8 | |
| 11:00 | 106.2 | |
| 10:00 | 104.6 | |
| 09:00 | 105.8 | |
| 08:00 | 102.8 | |
| 07:00 | 89.6 | |
| 06:00 | 84.3 | |
| 05:00 | 95 | |
| 04:00 | 89.4 | |
| 03:00 | 96.8 | |
| 02:00 | 103.3 | |
| 01:00 | 94.7 | |
| Sunday, 10/4 | ||
| 00:00 | 86.8 | |
| 23:00 | 98.7 | |
| 22:00 | 96.8 | |
| 21:00 | 94.8 | |
| 20:00 | 90.8 | |
| 19:00 | 88.6 | |
| 18:00 | 111.2 | |
| 17:00 | 111.3 | |
| 16:00 | 110.2 | |
| 15:00 | 108 | |
| 14:00 | 109.2 | |
| 13:00 | 105 | |
| 12:00 | 108.6 | |
| 11:00 | 115.8 | |
| 10:00 | 115.7 | |
| 09:00 | 113.3 | |
| 08:00 | 115 | |
| 07:00 | 115.4 | |
| 06:00 | 113.9 | |
| 05:00 | 114.3 | |
| 04:00 | 113.7 | |
| 03:00 | 114.4 | |
| 02:00 | 117.1 | |
| 01:00 | 119.7 | |
| Saturday, 10/3 | ||
| 00:00 | 118.7 | |
| 23:00 | 113.3 | |
| 22:00 | 110.6 | |
| 21:00 | 111.4 | |
| 20:00 | 116.9 | |
| 19:00 | 118.4 | |
| 18:00 | 116.9 | |
| 17:00 | 117.8 | |
| 16:00 | 117.9 | |
| 15:00 | 116.2 | |
| 14:00 | 115.4 | |
| 13:00 | 115.5 | |
| 12:00 | 109.7 | |
| 11:00 | 112.6 | |
| 10:00 | 112.4 | |
| 09:00 | 110.7 | |
| 08:00 | 107.8 | |
| 07:00 | 108.5 | |
| 06:00 | 108.3 | |
| 05:00 | 105.7 | |
| 04:00 | 107.3 | |
| 03:00 | 109.7 | |
| 02:00 | 112.3 | |
| 01:00 | 112.8 | |
| Friday, 10/2 | ||
| 00:00 | 112.5 | |
| 23:00 | 112.1 | |
| 22:00 | 110.5 | |
| 21:00 | 107.6 | |
| 20:00 | 107.8 | |
| 19:00 | 106.9 | |
| 18:00 | 107.6 | |
| 17:00 | 108 | |
| 16:00 | 106.7 | |
| 15:00 | 105.9 | |
| 14:00 | 110.5 | |
| 13:00 | 113.3 | |
| 12:00 | 104.4 | |
| 11:00 | 108.2 | |
| 10:00 | 110.4 | |
| 09:00 | 108.5 | |
| 08:00 | 107.4 | |
| 07:00 | 107.4 | |
| 06:00 | 105.5 | |
| 05:00 | 105.7 | |
| 04:00 | 105 | |
| 03:00 | 104.8 | |
| 02:00 | 107.2 | |
| 01:00 | 108.6 | |
| Thursday, 10/1 | ||
| 00:00 | 110.3 | |
| 23:00 | 110.1 | |
| 22:00 | 108.8 | |
| 21:00 | 106.3 | |
| 20:00 | 106 | |
| 19:00 | 103.2 | |
| 18:00 | 102.5 | |
| 17:00 | 104.8 | |
| 16:00 | 104.7 | |
| 15:00 | 107.6 | |
| 14:00 | 104.7 | |
| 13:00 | 102.7 | |
| 12:00 | 99.2 | |
| 11:00 | 99.1 | |
| 10:00 | 99.7 | |
| 09:00 | 99.4 | |
| 08:00 | 101.7 | |
| 07:00 | 104.7 | |
| 06:00 | 107.1 | |
| 05:00 | 105.6 | |
| 04:00 | 104.6 | |
| 03:00 | 101.2 | |
| 02:00 | 99.3 | |
| 01:00 | 98.4 | |
| Wednesday, 9/30 | ||
| 00:00 | 99.6 | |
| 23:00 | 98.9 | |
| 22:00 | 96.8 | |
Values as a table
| Day | µg/m³ | Note |
|---|---|---|
| Tue, 10/6 | 121.8 | above the limit · provisional |
| Mon, 10/5 | 104.8 | provisional |
| Sun, 10/4 | 115.9 | provisional |
| Sat, 10/3 | 116.9 | provisional |
| Fri, 10/2 | 109.1 | provisional |
| Thu, 10/1 | 106.5 | provisional |
| Wed, 9/30 | 97.1 | provisional |
| Tue, 9/29 | 112.5 | provisional |
| Mon, 9/28 | 100.8 | provisional |
| Sun, 9/27 | 94.5 | provisional |
| Sat, 9/26 | 88.7 | provisional |
| Fri, 9/25 | 84.1 | provisional |
| Thu, 9/24 | 88.5 | provisional |
| Wed, 9/23 | 85.2 | provisional |
| Tue, 9/22 | 82.5 | provisional |
| Mon, 9/21 | 92.8 | provisional |
| Sun, 9/20 | 87.8 | provisional |
| Sat, 9/19 | 85.9 | provisional |
| Fri, 9/18 | 98.1 | provisional |
| Thu, 9/17 | 100.4 | provisional |
| Wed, 9/16 | 104 | provisional |
| Tue, 9/15 | 81.1 | provisional |
| Mon, 9/14 | 109.5 | provisional |
| Sun, 9/13 | 105.7 | provisional |
| Sat, 9/12 | 87.2 | provisional |
| Fri, 9/11 | 74.2 | provisional |
| Thu, 9/10 | 94.2 | provisional |
| Wed, 9/9 | 129.8 | above the limit · provisional |
| Tue, 9/8 | 133.9 | above the limit · provisional |
| Mon, 9/7 | 119.4 | provisional |
Values as a table
| Month | µg/m³ | a year earlier | Note |
|---|---|---|---|
| October 2026 so far | 107.2 | 69.7 | measured in 100 % of hours · provisional · year before: same days |
| September 2026 | 89.4 | 77.8 | measured in 93 % of hours · provisional |
| August 2026 | 123.2 | 103.3 | measured in 92 % of hours · provisional · 2 days without data from the station |
| July 2026 | 110 | 102.8 | measured in 100 % of hours · provisional |
| June 2026 | 95.8 | 121.3 | measured in 90 % of hours · provisional |
| May 2026 | 104.1 | 92.5 | measured in 97 % of hours · provisional |
| April 2026 | 106.2 | 95.7 | measured in 88 % of hours · provisional · 2 days without data from the station |
| March 2026 | 97 | 91.4 | measured in 96 % of hours · provisional |
| February 2026 | 79.4 | 76.6 | measured in 78 % of hours · provisional · 4 days without data from the station |
| January 2026 | 74.1 | 70.8 | measured in 100 % of hours · provisional |
| December 2025 | 68.9 | 70.5 | measured in 96 % of hours · verified |
| November 2025 | 77.8 | 69.8 | measured in 96 % of hours · verified |
O₃ by year
Yardstick: EU limits (Directive 2008/50/EC)
| Measure | 2026* | 2025 | 2024 |
|---|---|---|---|
| Days with 8-hour average above 120 µg/m³ (target value 25) | 82 | 63 | 53 |
| Annual average, µg/m³ | 98.3* | 88 | 85.6 |
| Highest 8-hour average, µg/m³ | 173August 16 | 187June 26 | 164August 1 |
| Hours measured | 93 % | 96 % | 95 % |
| Days without any reading from the station | 8 | 0 | 3 |
* 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.
The column for 2023 is shown on wider screens.
The worst days of 2025
| Day | Highest 8 h | Times the limit |
|---|---|---|
| Jun 26, 2025 | 187 | 1.6 × |
| Jun 23, 2025 | 183 | 1.5 × |
| Jun 25, 2025 | 175 | 1.5 × |
| Jun 15, 2025 | 172 | 1.4 × |
| Jun 24, 2025 | 171 | 1.4 × |
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: 15
6 outages, 351 hours in total in the last 12 months.
Timeline of outages from October 7, 2025 to today
| From | To | Duration |
|---|---|---|
| Sep 2, 2026 12:00 | Sep 3, 2026 21:00 | 33 hours |
| Aug 29, 2026 18:00 | Sep 1, 2026 15:00 | 3 days |
| Jun 12, 2026 17:00 | Jun 13, 2026 19:00 | 26 hours |
| Jun 1, 2026 12:00 | Jun 2, 2026 13:00 | 25 hours |
| Apr 27, 2026 06:00 | Apr 30, 2026 09:00 | 3 days |
| Feb 13, 2026 06:00 | Feb 18, 2026 09:00 | 5 days |
Calculated from the hourly values the EEA publishes. If late values arrive afterwards, an outage gets shorter or disappears.
Where the data comes from
Measured by Slovenian Environment Agency. 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 EU limits come from Directive 2008/50/EC. Here they serve as a yardstick for comparison. 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.
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