SmogRank / World / Germany / North Rhine-Westphalia / May 2023
Most polluted cities in North Rhine-Westphalia, Germany, May 2023
32 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 31 days. Worst: Krefeld at 14.6 µg/m³, #137 of 1,543 cities in the world. Cleanest: Netphen at 7.1. 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%
- 2Duisburg 0%
- 3Datteln 0%
- 4Niederzier 0%
- 4Essen 0%
- 6Düsseldorf 0%
- 7Gelsenkirchen 0%
- 8Aachen 0%
- 9Solingen 0%
- 9Hagen 0%
- 11Titz 0%
- 12Oberhausen 0%
- 12Mönchengladbach 0%
- 12Bergheim 0%
- 15Unna 0%
- 15Dortmund 0%
- 17Köln 0%
- 17Borken 0%
- 19Bielefeld 0%
- 20Münster 0%
- 21Bonn 0%
- 22Roetgen 0%
- 23Ratingen 0%
- 23Lüdenscheid 0%
- 25Warstein 0%
- 26Leverkusen 0%
- 27Wuppertal 0%
- 27Soest 0%
- 29Marsberg 0%
- 29Hattingen 0%
- 31Schwerte 0%
- 32Netphen 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, May 2023, smogrank.com/de/region/north-rhine-westphalia/history/2023-05 (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.