SmogRank / World / Chile / Biobio / May 2024

Most unhealthy days in Biobio, Chile, May 2024

11 cities in Biobio, Chile ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Nacimiento, Chile, 31 of 31 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.

← Nacimiento 100% 75%0
Every city in Biobio, Chile ranked for May 2024, 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
    31 of 31
  2. 2Hualpén
    28 of 30
  3. 3Curanilahue
    26 of 31
  4. 4Laja
    26 of 31
  5. 5Coronel
    24 of 31
  6. 6Talcahuano
    23 of 31
  7. 7Los Ángeles
    21 of 31
  8. 8Chiguayante
    20 of 30
  9. 9Tomé
    20 of 31
  10. 10Concepción
    17 of 27
  11. 11San Pedro de la Paz
    14 of 31
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 2024 · All cities in Chile, May 2024 · Biobio now

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SmogRank, most polluted cities in Biobio, Chile, by unhealthy days, PM2.5, May 2024, smogrank.com/cl/region/biobio/history/2024-05?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.