SmogRank / World / South America / Chile / Maule Region

Most polluted cities in Maule Region, Chile

4 measured cities, last 30 days; 4 above the WHO 24-hour guideline. Worst: Linares at 26.0 µg/m³, #157 in the world.

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.

Maule Region: 4 measured citiesÑuble: 2 measured citiesO'Higgins Region: 2 measured citiesBiobio: 13 measured cities#4 Cauquenes: 21.7 µg/m³#3 Talca: 23.1 µg/m³#2 Curicó: 24.6 µg/m³#1 Linares: 26.0 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Linares 10% 7.5%0
Every measured city in Maule Region, Chile, 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. 1Linares 10%
  2. 2Curicó 3%
  3. 3Talca 3%
  4. 4Cauquenes 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

Estimated: cities without a monitor

Maule Region 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
Constitución≈ 21 µg/m³Moderate
Molina≈ 16 µg/m³Moderate
San Javier≈ 27 µg/m³Moderate
San Clemente≈ 24 µg/m³Moderate
Longaví≈ 18 µg/m³Moderate
Parral≈ 19 µg/m³Moderate
Colbún≈ 24 µg/m³Moderate
Sagrada Familia≈ 22 µg/m³Moderate

Bad-air episodes in Maule Region

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Maule Region, Chile, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/cl/region/maule-region?w=30d.

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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.

Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.