SmogRank / World / Chile / Biobio / July 2025

Most polluted cities in Biobio, Chile, July 2025

13 cities in Biobio, Chile ranked by their average PM2.5 over the 31 days. Worst: Nacimiento at 82.0 µg/m³, #3 of 2,832 cities in the world. Cleanest: Lota at 17.8. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Nacimiento 97% 90%0
Every city in Biobio, Chile ranked for July 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Nacimiento
    97%
  2. 2Laja
    90%
  3. 3Hualpén
    74%
  4. 4Hualqui
    71%
  5. 5Coronel
    68%
  6. 6Los Ángeles
    55%
  7. 7Curanilahue
    41%
  8. 8Talcahuano
    35%
  9. 9Concepción
    35%
  10. 10Chiguayante
    35%
  11. 11Tomé
    34%
  12. 12San Pedro de la Paz
    29%
  13. 13Lota
    0%
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

All cities in the world, July 2025 · All cities in Chile, July 2025 · Biobio now

Use this board

SmogRank, most polluted cities in Biobio, Chile, PM2.5, July 2025, smogrank.com/cl/region/biobio/history/2025-07 (accessed 7 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.