SmogRank / World / Germany / North Rhine-Westphalia / April 2025
Most polluted cities in North Rhine-Westphalia, Germany, April 2025
31 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 30 days. Worst: Krefeld at 12.2 µg/m³, #735 of 2,896 cities in the world. Cleanest: Lüdenscheid at 7.9. 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.
- 1Krefeld 0%
- 2Dortmund 0%
- 3Unna 0%
- 3Oberhausen 0%
- 3Münster 0%
- 6Niederzier 0%
- 7Gelsenkirchen 0%
- 8Datteln 0%
- 9Hagen 0%
- 9Essen 0%
- 11Düsseldorf 0%
- 11Duisburg 0%
- 13Mönchengladbach 0%
- 13Bottrop 0%
- 15Borken 0%
- 16Kaldenkirchen 0%
- 16Jüchen 0%
- 18Bielefeld 0%
- 19Wuppertal 0%
- 20Titz 0%
- 21Warstein 0%
- 22Hattingen 0%
- 23Soest 0%
- 24Köln 0%
- 25Bonn 0%
- 26Ratingen 0%
- 27Sinnersdorf 0%
- 28Schwerte 0%
- 29Aachen 0%
- 30Leverkusen 0%
- 31Lüdenscheid 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, April 2025, smogrank.com/de/region/north-rhine-westphalia/history/2025-04 (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.