SmogRank / World / Germany / North Rhine-Westphalia / March 2025
Most polluted cities in North Rhine-Westphalia, Germany, March 2025
32 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 31 days. Worst: Dortmund at 19.1 µg/m³, #633 of 2,809 cities in the world. Cleanest: Aachen at 12.5. 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.
- 1Dortmund 15%
- 2Bielefeld 15%
- 3Münster 12%
- 4Oberhausen 12%
- 5Warstein 9%
- 6Unna 8%
- 7Datteln 8%
- 8Krefeld 8%
- 9Bottrop 8%
- 10Hagen 8%
- 11Düsseldorf 8%
- 12Soest 8%
- 13Köln 8%
- 14Wuppertal 8%
- 14Bonn 8%
- 16Sinnersdorf 8%
- 16Hattingen 8%
- 18Ratingen 8%
- 18Leverkusen 8%
- 20Wesel 4%
- 21Gelsenkirchen 4%
- 22Niederzier 4%
- 23Borken 4%
- 24Duisburg 4%
- 25Essen 4%
- 26Mönchengladbach 4%
- 27Kaldenkirchen 4%
- 28Schwerte 4%
- 29Titz 4%
- 30Lüdenscheid 4%
- 31Aachen 4%
- 32Jüchen 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
All cities in the world, March 2025 · All cities in Germany, March 2025 · North Rhine-Westphalia now
Use this board
SmogRank, most polluted cities in North Rhine-Westphalia, Germany, PM2.5, March 2025, smogrank.com/de/region/north-rhine-westphalia/history/2025-03 (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.