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.
About 6.58K people in this city breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Talca 6.58K
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.
| City | 7-day estimate |
|---|---|
| Constitución | ≈ 21 µg/m³ |
| Molina | ≈ 16 µg/m³ |
| San Javier | ≈ 27 µg/m³ |
| San Clemente | ≈ 24 µg/m³ |
| Longaví | ≈ 18 µg/m³ |
| Parral | ≈ 19 µg/m³ |
| Colbún | ≈ 24 µg/m³ |
| Sagrada Familia | ≈ 22 µg/m³ |
Bad-air episodes in Maule Region
- Southern Chile, August 202622 to 24 August 2026, 3 days15 cities169 µg/m³peak, Osorno
- South-western Chile, August 202613 August 2026, 1 day10 cities162 µg/m³peak, Osorno
- Southern Chile, July 20262 to 8 July 2026, 7 days19 cities347 µg/m³peak, Osorno
- Chile, May 202625 to 27 May 2026, 3 days14 cities165 µg/m³peak, Linares
- Southern Chile, May 202618 to 22 May 2026, 5 days19 cities192 µg/m³peak, Hualpén
- Biobio, Maule Region and Ñuble, Chile, January 202619 to 21 January 2026, 3 days11 cities102 µg/m³peak, Los Ángeles
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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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.
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.