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.

About 294K people in these 4 cities breathed unhealthy air on an average day of July 2023.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Talcahuano 104K 100K0
Every city in Biobio, Chile ranked for July 2023 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Talcahuano
    104K
  2. 2Los Ángeles
    86.5K
  3. 3Coronel
    74.3K
  4. 4Chiguayante
    29.2K
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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).

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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.