What is the air quality trend in Chillán Viejo?

Over the past 15 days, Chillán Viejo had an average AQI of 52 based on station measurements. The worst day was 2026-08-24 with AQI 82.

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.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

325h

PM2.5 Station

325h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	55	18–82	15.9 µg/m³	8h	2
2026-09-04	43	15–93	11.3 µg/m³	23h	3
2026-09-03	39	14–70	9.8 µg/m³	23h	4
2026-09-02	42	12–100	10.9 µg/m³	23h	3
2026-09-01	61	16–177	19.9 µg/m³	24h	5
2026-08-31	51	18–152	14.4 µg/m³	23h	4
2026-08-30	54	21–143	15.2 µg/m³	24h	3
2026-08-29	44	17–155	11.9 µg/m³	23h	4
2026-08-28	38	17–68	9.7 µg/m³	24h	4
2026-08-27	50	18–159	14.5 µg/m³	24h	3
2026-08-26	49	9–149	14.4 µg/m³	22h	3
2026-08-25	54	20–159	15.8 µg/m³	24h	4
2026-08-24	82	32–184	29.7 µg/m³	24h	3
2026-08-23	75	13–164	25.5 µg/m³	24h	3
2026-08-22	57	22–165	18.3 µg/m³	12h	4

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