SmogRank / Austria / Upper Austria / Enns
Enns, month by month
Enns has a measured daily mean on 961 days since 6 May 2023. Its worst month was February 2025, at 77 US AQI (22.8 µg/m³), 365th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 35 US AQI (6.3 µg/m³).
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
10 months
| Month | Why |
|---|---|
| Oct 2025 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | 7 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 2 of 31 days measured; a month needs 22. The others: 29 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. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Enns's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7722.8 µg/m³ | 365thof 2,633 | Europe, 14 February to 1 March 2025 |
| January 2026 | 7220.4 µg/m³ | 403rdof 2,617 | Eastern Europe, January 2026 |
| January 2024 | 6818.1 µg/m³ | 331stof 2,385 | Europe, 8 to 27 January 2024 |
| December 2023 | 6516.4 µg/m³ | 246thof 2,247 | Europe, December 2023 Eastern Europe, November and December 2023 |
| January 2025 | 6416.3 µg/m³ | 427thof 2,474 | Europe, 24 December 2024 to 3 January 2025 |
| February 2026 | 6215.1 µg/m³ | 772ndof 2,866 | – |
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.
Enns's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Jan 2024 | 13348.3 µg/m³ | Europe, 8 to 27 January 2024 |
| 24 May 2025 | 13248.1 µg/m³ | – |
| 6 Dec 2023 | 12445.0 µg/m³ | Europe, December 2023 |
| 23 Feb 2025 | 12445.0 µg/m³ | Europe, 14 February to 1 March 2025 |
| 24 Feb 2025 | 11842.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 12 Jan 2024 | 11641.5 µg/m³ | Europe, 8 to 27 January 2024 |
| 1 Jan 2025 | 10637.7 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 31 Jan 2024 | 10436.6 µg/m³ | – |
| 5 Dec 2023 | 10235.8 µg/m³ | Europe, December 2023 |
| 10 Jan 2026 | 9532.8 µg/m³ | Eastern Europe, January 2026 |
Daily means, the highest since 6 May 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, Enns, Austria, 6 May 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/at/enns/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.
Enns now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).