SmogRank / World / Germany / North Rhine-Westphalia / April 2023
Most polluted cities in North Rhine-Westphalia, Germany, April 2023
30 cities in North Rhine-Westphalia, Germany ranked by their average PM2.5 over the 30 days. Worst: Krefeld at 14.7 µg/m³, #166 of 1,567 cities in the world. Cleanest: Netphen at 6.3. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
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 3%
- 2Schwerte 3%
- 3Krefeld 0%
- 4Duisburg 0%
- 5Niederzier 0%
- 6Datteln 0%
- 7Dortmund 0%
- 8Solingen 0%
- 8Essen 0%
- 10Borken 0%
- 11Warstein 0%
- 11Düsseldorf 0%
- 13Titz 0%
- 13Oberhausen 0%
- 13Gelsenkirchen 0%
- 13Bielefeld 0%
- 17Bergheim 0%
- 18Köln 0%
- 19Lüdenscheid 0%
- 19Aachen 0%
- 21Soest 0%
- 22Ratingen 0%
- 23Wuppertal 0%
- 24Mönchengladbach 0%
- 25Bonn 0%
- 26Leverkusen 0%
- 27Marsberg 0%
- 28Hattingen 0%
- 29Roetgen 0%
- 30Netphen 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, April 2023 · All cities in Germany, April 2023 · North Rhine-Westphalia now
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SmogRank, most polluted cities in North Rhine-Westphalia, Germany, PM2.5, April 2023, smogrank.com/de/region/north-rhine-westphalia/history/2023-04 (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.