SmogRank / World / South America / Chile / Biobio

Most polluted cities in Biobio, Chile

12 measured cities, last 30 days; 12 above the WHO 24-hour guideline. Worst: Hualpén at 37.2 µg/m³, #179 in the world.

Maule Region: 4 measured citiesÑuble: 2 measured citiesAraucania: 2 measured citiesBiobio: 12 measured cities#12 Concepción: 18.9 µg/m³#11 Chiguayante: 19.3 µg/m³#10 Lota: 20.7 µg/m³#9 Talcahuano: 21.2 µg/m³#8 Tomé: 21.3 µg/m³#7 San Pedro de la Paz: 21.8 µg/m³#6 Coronel: 23.2 µg/m³#5 Los Ángeles: 23.9 µg/m³#4 Hualqui: 28.6 µg/m³#3 Nacimiento: 30.5 µg/m³#2 Curanilahue: 31.2 µg/m³#1 Hualpén: 37.2 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Hualpén 37.2 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 105
  2. 2Curanilahue 92
  3. 3Nacimiento 91
  4. 4Hualqui 87
  5. 5Los Ángeles 79
  6. 6Coronel 77
  7. 7San Pedro de la Paz 75
  8. 8Tomé 74
  9. 9Talcahuano 74
  10. 10Lota 73
  11. 11Chiguayante 70
  12. 12Concepción 69
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 30 days to 2 Oct 2026, 04:00 UTC, smogrank.com/cl/region/biobio?w=30d.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.