SmogRank / World / Chile / Biobio / December 2023

Most unhealthy days in Biobio, Chile, December 2023

12 cities in Biobio, Chile ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Hualpén, Chile, 0 of 28 measured days. 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.

← Hualpén 0% 0.75%0
Every city in Biobio, Chile ranked for December 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. 1Hualpén
    0 of 28
  2. 2Nacimiento
    0 of 30
  3. 3Hualqui
    0 of 29
  4. 4Coronel
    0 of 31
  5. 5Tomé
    0 of 30
  6. 5San Pedro de la Paz
    0 of 24
  7. 7Talcahuano
    0 of 31
  8. 8Curanilahue
    0 of 29
  9. 9Chiguayante
    0 of 31
  10. 10Laja
    0 of 27
  11. 11Los Ángeles
    0 of 31
  12. 12Concepción
    0 of 22
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, December 2023 · All cities in Chile, December 2023 · Biobio now

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SmogRank, most polluted cities in Biobio, Chile, by unhealthy days, PM2.5, December 2023, smogrank.com/cl/region/biobio/history/2023-12?by=days (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.