SmogRank / World / Chile / Biobio / May 2023

Most polluted cities in Biobio, Chile, May 2023

12 cities in Biobio, Chile ranked by their average PM2.5 over the 31 days. Worst: Nacimiento at 65.1 µg/m³, #5 of 1,543 cities in the world. Cleanest: San Pedro de la Paz at 25.7. 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 90% 90%0
Every city in Biobio, Chile ranked for May 2023, 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
    90%
  2. 2Hualqui
    87%
  3. 3Laja
    81%
  4. 4Coronel
    71%
  5. 5Curanilahue
    63%
  6. 6Tomé
    50%
  7. 7Los Ángeles
    37%
  8. 8Chiguayante
    33%
  9. 9Concepción
    33%
  10. 10Talcahuano
    32%
  11. 11San Pedro de la Paz
    15%
  12. 12Lota
    10%
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, May 2023 · All cities in Chile, May 2023 · Biobio now

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SmogRank, most polluted cities in Biobio, Chile, PM2.5, May 2023, smogrank.com/cl/region/biobio/history/2023-05 (accessed 7 Oct 2026).

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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.