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 35.7
  2. 2Nacimiento 31.1
  3. 3Curanilahue 30.7
  4. 4Hualqui 21.9
  5. 5Coronel 21.7
  6. 6Los Ángeles 20.3
  7. 7Talcahuano 19.2
  8. 8Lota 18.6
  9. 9Tomé 17.8
  10. 10San Pedro de la Paz 16.8
  11. 11Chiguayante 16.6
  12. 12Concepción 15.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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, 04:00 UTC, smogrank.com/cl/region/biobio?w=7d.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.