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 4
  2. 2Curanilahue 4
  3. 3Nacimiento 4
  4. 4Hualqui 3
  5. 5Los Ángeles 3
  6. 6Coronel 3
  7. 7San Pedro de la Paz 3
  8. 8Tomé 3
  9. 9Talcahuano 3
  10. 10Lota 3
  11. 11Chiguayante 2
  12. 12Concepción 2
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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/m³Low risk
Penco≈ 5 µg/m³Low risk
Cañete≈ 4 µg/m³Low risk
Cabrero≈ 5 µg/m³Low risk
Mulchén≈ 4 µg/m³Low risk
Arauco≈ 5 µg/m³Low risk
Lebu≈ 5 µg/m³Low risk
Los Álamos≈ 5 µg/m³Low risk

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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 Canada AQHI+ PM2.5 sub-index.