What is the air quality trend in Chillán Viejo?

Over the past 7 days, Chillán Viejo had an average AQI of 45 based on station measurements. The worst day was 2026-06-04 with AQI 67.

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.

109

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

91h

PM2.5 Station

91h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-08	52	15–109	15.9 µg/m³	12h	2
2026-06-07	52	7–157	17.0 µg/m³	13h	2
2026-06-06	43	6–147	11.9 µg/m³	14h	1
2026-06-05	25	9–61	6.2 µg/m³	12h	1
2026-06-04	67	9–171	23.8 µg/m³	10h	2
2026-06-03	37	9–87	10.1 µg/m³	13h	1
2026-06-02	40	9–118	10.7 µg/m³	17h	1

Back to Chillán Viejo Air Quality