SmogRank / Austria / Upper Austria / Freistadt

Freistadt, month by month

Freistadt has a measured daily mean on 1,007 days since 1 January 2023. Its worst month was February 2025, at 60 US AQI (14.0 µg/m³), 920th of 2,633 cities on that month's world ranking. Its cleanest was December 2025, at 19 US AQI (3.5 µg/m³). 2025 averaged 33 US AQI (6.0 µg/m³), against 33 US AQI (5.9 µg/m³) in 2023.

Every month since 2023

202636 so far272 days measured2,378th of 2,791 in the world
Jan41#1,675Feb41#2,138Mar53#1,593Apr38#1,926May26#2,446Jun28#2,148Jul27#2,617Aug35#2,374Sep26#2,521Oct44#996
202533 for the year305 days measured2,360th of 2,681 in the world
Jan25#2,312Feb60#920Mar46#1,901Apr33#2,309May26#2,400Jun35#2,128Jul30#2,521Aug38#2,217Sep22#2,940Oct13 daysNov27#2,433Dec19#2,907
2024too few days for a mean (a year needs 257)146 days measured
Jan37#1,657Feb26#2,218Mar11 daysApr11 daysMay11 daysJun9 daysJul9 daysAug3 daysSepnoneOct2 daysNov7 daysDec32#2,139
202333 for the year284 days measured1,184th of 1,355 in the world
Jan9 daysFeb2 daysMar11 daysApr43#861May40#1,103Jun36#1,279Jul29#1,204Aug21#1,935Sep40#1,431Oct33#1,492Nov26#2,030Dec31#1,909
Each square is a month's mean PM2.5 in US AQI from Freistadt'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 Freistadt 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

13 months
MonthWhy
Oct 202513 of 31 days measured; a month needs 22. The others: 12 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Nov 20247 of 30 days measured; a month needs 21. The others: 23 with readings for part of the day (a day needs 18 hours).
Oct 20242 of 31 days measured; a month needs 22. The others: 29 with readings for part of the day (a day needs 18 hours).
Sep 2024No day measured. The others: 21 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours).
Aug 20243 of 31 days measured; a month needs 22. The others: 17 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours), 2 with readings left out by our checks.
Jul 20249 of 31 days measured; a month needs 22. The others: 22 with readings for part of the day (a day needs 18 hours).
Jun 20249 of 30 days measured; a month needs 21. The others: 21 with readings for part of the day (a day needs 18 hours).
May 202411 of 31 days measured; a month needs 22. The others: 20 with readings for part of the day (a day needs 18 hours).
Apr 202411 of 30 days measured; a month needs 21. The others: 1 with no readings from the monitor, 18 with readings for part of the day (a day needs 18 hours).
Mar 202411 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours).
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive.
Jan 20239 of 31 days measured; a month needs 22. The others: 15 with readings for part of the day (a day needs 18 hours), 7 missing from OpenAQ's archive.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Freistadt's worst months

MonthUS AQIDays measuredWorld rank
February 2025 6014.0 µg/m³25 of 28920thof 2,633
March 2026 5310.3 µg/m³31 of 311,593rdof 2,971
March 2025 468.2 µg/m³27 of 311,901stof 2,862
April 2023 437.8 µg/m³27 of 30861stof 1,622
January 2026 417.4 µg/m³29 of 311,675thof 2,617
February 2026 417.4 µg/m³28 of 282,138thof 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.

Freistadt's worst days

DayUS AQI
23 Feb 2025 8024.6 µg/m³
22 Feb 2026 7723.3 µg/m³
8 Feb 2025 7522.2 µg/m³
15 Apr 2026 7521.9 µg/m³
23 Jan 2026 7421.3 µg/m³
18 Feb 2025 7320.9 µg/m³
1 Mar 2024 7220.5 µg/m³
14 Apr 2026 7220.4 µg/m³
13 Dec 2023 7119.8 µg/m³
22 Feb 2025 7019.3 µg/m³

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, Freistadt, 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/freistadt/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.

Freistadt 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).