SmogRank / Austria / Carinthia / Klagenfurt am Wörthersee
Klagenfurt am Wörthersee, month by month
Klagenfurt am Wörthersee has a measured daily mean on 1,060 days since 1 January 2023. Its worst month was January 2026, at 79 US AQI (24.1 µg/m³), 268th of 2,617 cities on that month's world ranking. Its cleanest was May 2026, at 29 US AQI (5.2 µg/m³). 2025 averaged 55 US AQI (11.2 µg/m³), against 56 US AQI (11.7 µg/m³) in 2023.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
11 months
| Month | Why |
|---|---|
| Oct 2025 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | 6 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 5 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Klagenfurt am Wörthersee's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 7924.1 µg/m³ | 268thof 2,617 | Europe, January and February 2026 Europe, December 2025 to January 2026 |
| February 2025 | 7622.3 µg/m³ | 395thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2024 | 7421.2 µg/m³ | 236thof 2,385 | – |
| January 2025 | 7320.7 µg/m³ | 277thof 2,474 | Germany, France and 19 more countries, January 2025 Europe, 24 December 2024 to 3 January 2025 |
| February 2023 | 7220.3 µg/m³ | 127thof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023 |
| December 2024 | 6918.5 µg/m³ | 318thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Klagenfurt am Wörthersee's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2025 | 16575.3 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 12 Feb 2025 | 12946.8 µg/m³ | Europe, 1 to 14 February 2025 |
| 23 Jan 2026 | 11541.3 µg/m³ | Europe, January and February 2026 |
| 25 Jan 2026 | 11541.0 µg/m³ | Europe, January and February 2026 |
| 10 Feb 2025 | 11440.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 21 Jan 2025 | 10838.5 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 2 Jan 2025 | 10838.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 22 Feb 2025 | 10737.8 µg/m³ | Europe, 14 February to 1 March 2025 |
| 1 Jan 2026 | 10637.4 µg/m³ | Europe, December 2025 to January 2026 |
| 24 Jan 2026 | 10537.0 µg/m³ | Europe, January and February 2026 |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Klagenfurt am Wörthersee, Austria, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/at/klagenfurt-am-woerthersee/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Klagenfurt am Wörthersee now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).