What is the air quality trend in Chillán?

Over the past 7 days, Chillán had an average AQI of 65 based on station measurements. The worst day was 2026-05-23 with AQI 85.

How is Chillán air quality measured?

Air quality in Chillán is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Chillán, Chile

Name: Chillán Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Chillán, Chile.

208

Current AQI
Very unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

155h

PM2.5 Station

155h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	68	9–224	32.2 µg/m³	21h	2
2026-05-28	48	12–127	14.4 µg/m³	22h	2
2026-05-27	56	15–158	17.1 µg/m³	23h	3
2026-05-26	67	16–182	23.0 µg/m³	22h	2
2026-05-25	55	18–160	16.7 µg/m³	22h	3
2026-05-24	78	21–162	27.1 µg/m³	24h	3
2026-05-23	85	8–500	46.0 µg/m³	21h	2

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