What is the air quality trend in Chillán?

Over the past 15 days, Chillán had an average AQI of 67 based on station measurements. The worst day was 2026-05-29 with AQI 105.

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.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

264h

PM2.5 Station

264h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	64	24–113	20.6 µg/m³	6h	2
2026-06-08	67	5–168	24.2 µg/m³	19h	2
2026-06-07	44	5–132	12.4 µg/m³	20h	2
2026-06-06	46	13–112	13.3 µg/m³	19h	2
2026-06-05	78	15–500	75.7 µg/m³	19h	2
2026-06-04	90	6–241	45.2 µg/m³	20h	1
2026-06-03	47	5–158	14.8 µg/m³	24h	2
2026-06-02	52	15–132	15.7 µg/m³	18h	2
2026-06-01	67	17–151	20.6 µg/m³	17h	2
2026-05-31	58	13–153	17.8 µg/m³	14h	1
2026-05-30	68	17–158	21.9 µg/m³	19h	2
2026-05-29	105	28–500	75.1 µg/m³	21h	2
2026-05-28	65	17–171	21.8 µg/m³	16h	2
2026-05-27	81	15–179	30.5 µg/m³	18h	2
2026-05-26	82	21–163	29.3 µg/m³	14h	2

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