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 µg/m³ 30 µg/m³15 WHO 24-hour guideline0
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 51
  2. 2Nacimiento 45
  3. 3Curanilahue 44
  4. 4Hualqui 32
  5. 5Coronel 31
  6. 6Los Ángeles 29
  7. 7Talcahuano 28
  8. 8Lota 27
  9. 9Tomé 26
  10. 10San Pedro de la Paz 24
  11. 11Chiguayante 24
  12. 12Concepción 22
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. 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/m³Excellent
Penco≈ 5 µg/m³Excellent
Cañete≈ 4 µg/m³Excellent
Cabrero≈ 5 µg/m³Excellent
Mulchén≈ 4 µg/m³Excellent
Arauco≈ 5 µg/m³Excellent
Lebu≈ 5 µg/m³Excellent
Los Álamos≈ 5 µg/m³Excellent

Use this board

SmogRank, most polluted cities in Biobio, Chile, PM2.5, last 7 days to 2 Oct 2026, 06:00 UTC, smogrank.com/cl/region/biobio?w=7d.

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the China AQI PM2.5 sub-index.