SmogRank / World / Germany / North Rhine-Westphalia / 2025
Most polluted cities in North Rhine-Westphalia, Germany, 2025
32 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 365 days; 32 above the WHO annual guideline (5.0 µg/m³). Worst: Dortmund at 11.5 µg/m³, #640 of 2,624 cities in the world. Cleanest: Aachen at 8.0. 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.
- 1Münster 2%
- 2Bielefeld 2%
- 3Dortmund 2%
- 4Oberhausen 2%
- 5Bonn 2%
- 6Datteln 2%
- 7Krefeld 2%
- 8Unna 2%
- 9Bottrop 2%
- 10Kaldenkirchen 2%
- 11Borken 2%
- 12Köln 2%
- 13Duisburg 2%
- 14Düsseldorf 2%
- 15Wesel 1%
- 16Warstein 1%
- 17Titz 1%
- 18Hagen 1%
- 19Ratingen 1%
- 20Wuppertal 1%
- 21Gelsenkirchen 1%
- 22Hattingen 1%
- 23Soest 1%
- 24Aachen 1%
- 25Niederzier 1%
- 26Sinnersdorf 1%
- 26Leverkusen 1%
- 28Essen 1%
- 29Schwerte 1%
- 30Lüdenscheid 1%
- 31Mönchengladbach 1%
- 32Jüchen 1%
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, 2025, smogrank.com/de/region/north-rhine-westphalia/history/2025 (accessed 6 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.