SmogRank / Austria / Salzburg / Zell am See

Zell am See, month by month

Zell am See has a measured daily mean on 863 days since 6 May 2023. Its worst month was January 2026, at 56 US AQI (11.6 µg/m³), 955th of 2,617 cities on that month's world ranking. Its cleanest was September 2025, at 16 US AQI (2.9 µg/m³).

Every month since 2023

202637 so far256 days measured2,348th of 2,791 in the world
Jan56#955Feb47#1,829Mar48#1,950Apr29#2,423May22#2,666Jun9 daysJul30#2,540Aug34#2,407Sep19#2,849Oct35#1,624
202534 for the year300 days measured2,340th of 2,681 in the world
Jan53#960Feb53#1,145Mar29#2,424Apr14 daysMay20#2,675Jun37#2,057Jul21#2,785Aug33#2,510Sep16#3,065Oct13 daysNov29#2,349Dec49#1,614
2024too few days for a mean (a year needs 257)85 days measured
Jan52#932Feb6 daysMarnoneAprnoneMaynoneJunnoneJul7 daysAug5 daysSepnoneOct3 daysNov7 daysDec52#944
2023too few days for a mean (a year needs 256)222 days measured
JanFebMarAprMay25#1,478Jun19 daysJul27#1,249Aug28#1,805Sep30#1,922Oct29#1,721Nov25#2,063Dec52#850
Each square is a month's mean PM2.5 in US AQI from Zell am See's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Zell am See marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

14 months
MonthWhy
Jun 20269 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Oct 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Apr 202514 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Nov 20247 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
Oct 20243 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20245 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jul 20247 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 20246 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 22 with under 18 hours of readings or readings that failed our checks.
Jun 202319 of 30 days measured; a month needs 21. The others: 11 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.

Zell am See's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2026 5611.6 µg/m³29 of 31955thof 2,617–
February 2025 5310.4 µg/m³25 of 281,145thof 2,633–
January 2025 5310.2 µg/m³29 of 31960thof 2,474Europe, 24 December 2024 to 3 January 2025
January 2024 529.6 µg/m³31 of 31932ndof 2,385–
December 2024 529.6 µg/m³26 of 31944thof 2,616Europe, 24 December 2024 to 3 January 2025
December 2023 529.4 µg/m³31 of 31850thof 2,247–

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.

Zell am See's worst days

DayUS AQIEpisode
1 Jan 2025 9834.5 µg/m³Europe, 24 December 2024 to 3 January 2025
11 Jun 2025 7220.4 µg/m³–
31 Dec 2024 7120.0 µg/m³Europe, 24 December 2024 to 3 January 2025
2 Jan 2025 7019.1 µg/m³Europe, 24 December 2024 to 3 January 2025
28 Dec 2024 6818.4 µg/m³Europe, 24 December 2024 to 3 January 2025
21 Feb 2026 6818.2 µg/m³–
18 Feb 2025 6717.9 µg/m³–
6 Dec 2023 6717.6 µg/m³–
30 Dec 2024 6617.1 µg/m³Europe, 24 December 2024 to 3 January 2025
14 Jan 2024 6516.8 µg/m³–

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, Zell am See, 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/zell-am-see/history (accessed 12 Oct 2026).

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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.

Zell am See 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).