SmogRank / World / Chile / Biobio / July 2023
Most polluted cities in Biobio, Chile, July 2023
11 cities in Biobio, Chile ranked by their average PM2.5 over the 31 days. Worst: Nacimiento at 85.0 µg/m³, #2 of 1,375 cities in the world. Cleanest: Lota at 23.2. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for one of these days. Cities in the United States and Europe have it 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.
- 1Nacimiento 86%
- 2Curanilahue 82%
- 3Hualqui 72%
- 4Los Ángeles 69%
- 5Talcahuano 69%
- 6Coronel 69%
- 7Tomé 55%
- 8Concepción 45%
- 9Chiguayante 34%
- 10San Pedro de la Paz 21%
- 11Lota 7%
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, July 2023 · All cities in Chile, July 2023 · Biobio now
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SmogRank, most polluted cities in Biobio, Chile, PM2.5, July 2023, smogrank.com/cl/region/biobio/history/2023-07 (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.