SmogRank / World / Germany / North Rhine-Westphalia / September 2025
Most polluted cities in North Rhine-Westphalia, Germany, September 2025
33 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 30 days. Worst: Hagen at 7.5 µg/m³, #1,433 of 3,052 cities in the world. Cleanest: Roetgen at 3.5. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Hagen 0%
- 1Dortmund 0%
- 3Gelsenkirchen 0%
- 4Bottrop 0%
- 5Unna 0%
- 6Oberhausen 0%
- 7Krefeld 0%
- 7Essen 0%
- 7Düsseldorf 0%
- 10Münster 0%
- 11Duisburg 0%
- 12Wuppertal 0%
- 12Datteln 0%
- 14Köln 0%
- 14Bielefeld 0%
- 16Mönchengladbach 0%
- 16Kaldenkirchen 0%
- 16Jüchen 0%
- 16Borken 0%
- 20Bonn 0%
- 21Warstein 0%
- 21Soest 0%
- 21Sinnersdorf 0%
- 21Schwerte 0%
- 21Leverkusen 0%
- 26Wesel 0%
- 27Niederzier 0%
- 27Hattingen 0%
- 29Titz 0%
- 30Lüdenscheid 0%
- 31Ratingen 0%
- 32Aachen 0%
- 33Roetgen 0%
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
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SmogRank, most polluted cities in North Rhine-Westphalia, Germany, PM2.5, September 2025, smogrank.com/de/region/north-rhine-westphalia/history/2025-09 (accessed 7 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.