What is the air quality trend in Chillán?

Over the past 21 days, Chillán had an average AQI of 58 based on station measurements. The worst day was 2026-05-26 with AQI 80.

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

432h

PM2.5 Station

432h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	80	67–92	26.0 µg/m³	4h	2
2026-06-08	63	7–148	20.0 µg/m³	21h	2
2026-06-07	46	8–117	13.1 µg/m³	24h	2
2026-06-06	44	3–162	14.0 µg/m³	21h	2
2026-06-05	39	9–122	10.5 µg/m³	23h	2
2026-06-04	43	6–242	17.6 µg/m³	22h	2
2026-06-03	39	5–93	10.6 µg/m³	23h	2
2026-06-02	51	14–167	16.6 µg/m³	20h	2
2026-06-01	57	7–162	19.2 µg/m³	18h	2
2026-05-31	60	1–216	22.5 µg/m³	21h	2
2026-05-30	53	17–133	15.7 µg/m³	18h	2
2026-05-29	54	10–127	16.1 µg/m³	22h	2
2026-05-28	56	10–144	17.2 µg/m³	21h	3
2026-05-27	65	5–164	21.9 µg/m³	22h	2
2026-05-26	80	23–160	27.4 µg/m³	22h	3
2026-05-25	73	16–211	31.4 µg/m³	23h	2
2026-05-24	73	18–133	23.0 µg/m³	22h	2
2026-05-23	58	22–163	17.9 µg/m³	23h	3
2026-05-22	60	14–155	18.8 µg/m³	23h	2
2026-05-21	75	16–270	33.3 µg/m³	22h	2
2026-05-20	61	10–125	19.2 µg/m³	17h	2

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