What is the air quality trend in Chillán?

Over the past 20 days, Chillán had an average AQI of 60 based on station measurements. The worst day was 2026-05-23 with AQI 82.

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

436h

PM2.5 Station

436h · 1 station

Temperature GFS model

80pt

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	82	8–500	43.4 µg/m³	23h	2
2026-05-22	59	2–156	18.7 µg/m³	20h	2
2026-05-21	66	18–151	20.5 µg/m³	21h	2
2026-05-20	74	11–242	29.9 µg/m³	19h	2
2026-05-19	76	5–215	31.9 µg/m³	21h	2
2026-05-18	45	3–155	13.7 µg/m³	17h	2
2026-05-17	55	1–182	20.5 µg/m³	18h	2
2026-05-16	54	20–133	15.5 µg/m³	22h	3
2026-05-15	51	11–152	15.3 µg/m³	24h	4
2026-05-14	42	5–109	11.3 µg/m³	24h	3
2026-05-13	58	8–157	17.2 µg/m³	24h	3
2026-05-12	63	15–124	19.2 µg/m³	24h	4
2026-05-11	61	3–156	18.9 µg/m³	23h	3
2026-05-10	60	15–140	17.8 µg/m³	22h	4

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