SmogRank / World / South America / Chile / Biobio

Most polluted cities in Biobio, Chile

12 measured cities, this year; 12 above the WHO annual guideline. Worst: Hualpén at 44.2 µg/m³, #153 in the world.

Maule Region: 4 measured citiesÑuble: 2 measured citiesAraucania: 2 measured citiesBiobio: 12 measured cities#12 Lota: 21.7 µg/m³#11 Chiguayante: 23.6 µg/m³#10 Concepción: 23.7 µg/m³#9 Tomé: 24.7 µg/m³#8 San Pedro de la Paz: 25.0 µg/m³#7 Coronel: 30.1 µg/m³#6 Talcahuano: 30.3 µg/m³#5 Los Ángeles: 31.9 µg/m³#4 Hualqui: 34.1 µg/m³#3 Curanilahue: 39.9 µg/m³#2 Nacimiento: 43.8 µg/m³#1 Hualpén: 44.2 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Hualpén 44.2 µg/m³ 40 µg/m³5 WHO annual guideline
Every measured city in Biobio, Chile, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Hualpén 1228.8×
  2. 2Nacimiento 1218.8×
  3. 3Curanilahue 1128.0×
  4. 4Hualqui 986.8×
  5. 5Los Ángeles 936.4×
  6. 6Talcahuano 906.1×
  7. 7Coronel 906.0×
  8. 8San Pedro de la Paz 815.0×
  9. 9Tomé 804.9×
  10. 10Concepción 784.7×
  11. 11Chiguayante 784.7×
  12. 12Lota 744.3×
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, this year to 2 Oct 2026, 10:00 UTC, smogrank.com/cl/region/biobio?w=year.

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