SmogRank / World / Chile / Biobio / April 2026

Most polluted cities in Biobio, Chile, April 2026

13 cities in Biobio, Chile ranked by their average PM2.5 over the 30 days. Worst: Nacimiento at 38.7 µg/m³, #143 of 2,914 cities in the world. Cleanest: San Pedro de la Paz at 23.2. A city needs measurements on 70% of the days to be ranked.

About 63.7K people in these 4 cities breathed unhealthy air on an average day of April 2026.

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.

← Los Ángeles 29.3K 20K0
Every city in Biobio, Chile ranked for April 2026 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. 1Los Ángeles
    29.3K
  2. 2Coronel
    21.6K
  3. 3Talcahuano
    10K
  4. 4Chiguayante
    2.82K
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, April 2026 · All cities in Chile, April 2026 · Biobio now

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SmogRank, most polluted cities in Biobio, Chile, PM2.5, April 2026, smogrank.com/cl/region/biobio/history/2026-04 (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.