SmogRank / World / South America / Chile / Biobio

Most polluted cities in Biobio, Chile

12 measured cities, last 7 days; 12 above the WHO 24-hour guideline. Worst: Hualpén at 35.7 µg/m³, #57 in the world.

Maule Region: 4 measured citiesÑuble: 2 measured citiesAraucania: 2 measured citiesBiobio: 12 measured cities#12 Concepción: 15.1 µg/m³#11 Chiguayante: 16.6 µg/m³#10 San Pedro de la Paz: 16.8 µg/m³#9 Tomé: 17.8 µg/m³#8 Lota: 18.6 µg/m³#7 Talcahuano: 19.2 µg/m³#6 Los Ángeles: 20.3 µg/m³#5 Coronel: 21.7 µg/m³#4 Hualqui: 21.9 µg/m³#3 Curanilahue: 30.7 µg/m³#2 Nacimiento: 31.1 µg/m³#1 Hualpén: 35.7 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Hualpén 35.7 WHO 24-hour guideline
Every measured city in Biobio, Chile, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Hualpén 101
  2. 2Nacimiento 92
  3. 3Curanilahue 91
  4. 4Hualqui 75
  5. 5Coronel 74
  6. 6Los Ángeles 72
  7. 7Talcahuano 70
  8. 8Lota 69
  9. 9Tomé 67
  10. 10San Pedro de la Paz 65
  11. 11Chiguayante 65
  12. 12Concepción 62
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

Estimated: cities without a monitor

Biobio cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Villa Mercedes≈ 5 µg/m³Good
Penco≈ 5 µg/m³Good
Cañete≈ 4 µg/m³Good
Cabrero≈ 5 µg/m³Good
Mulchén≈ 4 µg/m³Good
Arauco≈ 5 µg/m³Good
Lebu≈ 5 µg/m³Good
Los Álamos≈ 5 µg/m³Good

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SmogRank, most polluted cities in Biobio, Chile, PM2.5, last 7 days to 2 Oct 2026, 05:00 UTC, smogrank.com/cl/region/biobio?w=7d.

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Updated 2026-10-02 05:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.