SmogRank / World / Chile / Biobio / April 2023
Most polluted cities in Biobio, Chile, April 2023
13 cities in Biobio, Chile ranked by their average PM2.5 over the 30 days. Worst: Nacimiento at 33.8 µg/m³, #30 of 1,567 cities in the world. Cleanest: Concepción at 19.4. 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.
- 1Nacimiento 33%
- 2Curanilahue 27%
- 3Hualpén 12%
- 4Laja 11%
- 5Tomé 10%
- 6Los Ángeles 8%
- 7Coronel 7%
- 8Talcahuano 7%
- 9Hualqui 4%
- 10Concepción 4%
- 11San Pedro de la Paz 4%
- 12Lota 0%
- 13Chiguayante 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 Chile, April 2023 · Biobio now
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SmogRank, most polluted cities in Biobio, Chile, PM2.5, April 2023, smogrank.com/cl/region/biobio/history/2023-04 (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.