SmogRank / Austria / Vorarlberg / Dornbirn

Dornbirn, month by month

Dornbirn has a measured daily mean on 162 days since 7 April 2026. Its worst month was April 2026, at 33 US AQI (5.9 µg/m³), 2,241st of 2,941 cities on that month's world ranking. Its cleanest was September 2026, at 19 US AQI (3.5 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 200)162 days measured

JanFebMarApr33#2,241 May21#2,692 Jun21#2,354 Jul20#2,726 Aug23#2,830 Sep19#2,849Octnone

Each square is a month's mean PM2.5 in US AQI from Dornbirn'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 Dornbirn marked; each year, the year's.

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

1 month

Month	Why
Oct 2026	No day measured. The others: 11 with no readings from the monitor, 1 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.

Dornbirn's worst months

Month	US AQI	Days measured	World rank
April 2026	335.9 µg/m³	24 of 30	2,241stof 2,941
August 2026	234.1 µg/m³	30 of 31	2,830thof 2,896
May 2026	213.8 µg/m³	29 of 31	2,692ndof 2,874
June 2026	213.7 µg/m³	25 of 30	2,354thof 2,497
July 2026	203.6 µg/m³	31 of 31	2,726thof 2,784
September 2026	193.5 µg/m³	23 of 30	2,849thof 2,981

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.

Dornbirn's worst days

Day	US AQI
26 May 2026	5410.9 µg/m³
11 Apr 2026	529.5 µg/m³
8 Apr 2026	529.4 µg/m³
27 May 2026	498.9 µg/m³
28 Apr 2026	498.8 µg/m³
10 Apr 2026	478.4 µg/m³
3 Aug 2026	458.1 µg/m³
7 Apr 2026	427.5 µg/m³
9 Apr 2026	427.5 µg/m³
4 Aug 2026	417.4 µg/m³

Daily means, the highest since 7 Apr 2026; 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, Dornbirn, Austria, 7 Apr 2026 – 24 Sep 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/at/dornbirn/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.

Dornbirn now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 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).