SmogRank / Austria / Salzburg / Hallein
Hallein, month by month
Hallein has a measured daily mean on 616 days since 14 November 2024. Its worst month was February 2025, at 70 US AQI (19.3 µg/m³), 619th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 21 US AQI (3.8 µg/m³).
Every month since 2024
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
2 months
| Month | Why |
|---|---|
| Oct 2025 | 13 of 31 days measured; a month needs 22. The others: 12 with no readings from the monitors, 6 with readings for part of the day (a day needs 18 hours). |
| Nov 2024 | 6 of 30 days measured; a month needs 21. The others: 11 with readings for part of the day (a day needs 18 hours). |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Hallein's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7019.3 µg/m³ | 619thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2026 | 6516.5 µg/m³ | 664thof 2,617 | Europe, January and February 2026 |
| January 2025 | 5410.8 µg/m³ | 869thof 2,474 | Germany, France and 19 more countries, January 2025 |
| March 2026 | 5410.8 µg/m³ | 1,464thof 2,971 | – |
| December 2025 | 5310.2 µg/m³ | 1,287thof 3,006 | – |
| February 2026 | 529.9 µg/m³ | 1,418thof 2,866 | Europe, January and February 2026 |
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.
Hallein's worst days
| Day | US AQI | Episode |
|---|---|---|
| 23 Jan 2026 | 12746.1 µg/m³ | Europe, January and February 2026 |
| 24 Jan 2026 | 11741.8 µg/m³ | Europe, January and February 2026 |
| 22 Jan 2026 | 11641.4 µg/m³ | Europe, January and February 2026 |
| 10 Feb 2025 | 11440.8 µg/m³ | Europe, 1 to 14 February 2025 |
| 25 Jan 2026 | 10838.5 µg/m³ | Europe, January and February 2026 |
| 9 Feb 2025 | 9532.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 21 Jan 2026 | 9130.5 µg/m³ | Europe, January and February 2026 |
| 11 Feb 2025 | 8929.3 µg/m³ | Europe, 1 to 14 February 2025 |
| 11 Jun 2025 | 8326.2 µg/m³ | Europe, June 2025 |
| 22 Jan 2025 | 8326.1 µg/m³ | Germany, France and 19 more countries, January 2025 |
Daily means, the highest since 14 Nov 2024; 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, Hallein, Austria, 14 Nov 2024 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/at/hallein/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.
Hallein now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).