What is the air quality trend in Chillán Viejo?

Over the past 14 days, Chillán Viejo had an average AQI of 63 based on station measurements. The worst day was 2026-05-23 with AQI 85.

How is Chillán Viejo air quality measured?

Air quality in Chillán Viejo 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 Viejo, Chile

Name: Chillán Viejo 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 Viejo, Chile.

163

Current AQI
Unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

322h

PM2.5 Station

322h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	66	9–224	25.0 µg/m³	22h	3
2026-05-28	55	21–110	15.9 µg/m³	23h	3
2026-05-27	66	15–171	22.5 µg/m³	24h	4
2026-05-26	64	25–152	19.5 µg/m³	24h	3
2026-05-25	59	18–136	17.5 µg/m³	24h	4
2026-05-24	71	17–180	23.8 µg/m³	24h	4
2026-05-23	85	22–182	30.8 µg/m³	24h	4
2026-05-22	57	18–122	17.0 µg/m³	24h	3
2026-05-21	59	12–121	17.2 µg/m³	23h	3
2026-05-20	75	5–196	28.6 µg/m³	24h	3
2026-05-19	71	10–181	25.6 µg/m³	23h	3
2026-05-18	56	3–155	17.3 µg/m³	22h	3
2026-05-17	52	1–156	16.8 µg/m³	20h	3
2026-05-16	57	19–170	18.6 µg/m³	21h	4

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