What is the air quality trend in Chillán Viejo?

Over the past 21 days, Chillán Viejo had an average AQI of 65 based on station measurements. The worst day was 2026-05-24 with AQI 91.

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

463h

PM2.5 Station

463h · 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	73	15–159	24.7 µg/m³	9h	3
2026-06-08	58	9–172	19.0 µg/m³	24h	3
2026-06-07	52	13–93	15.2 µg/m³	22h	3
2026-06-06	58	17–154	17.3 µg/m³	22h	3
2026-06-05	61	11–323	26.6 µg/m³	22h	3
2026-06-04	63	18–200	23.6 µg/m³	23h	3
2026-06-03	59	20–137	17.8 µg/m³	22h	3
2026-06-02	56	13–165	17.9 µg/m³	23h	4
2026-06-01	45	12–96	12.6 µg/m³	24h	3
2026-05-31	50	13–147	14.9 µg/m³	23h	2
2026-05-30	48	17–95	13.0 µg/m³	24h	3
2026-05-29	70	10–154	22.2 µg/m³	23h	3
2026-05-28	64	14–139	19.7 µg/m³	22h	3
2026-05-27	76	18–143	24.5 µg/m³	23h	3
2026-05-26	77	20–180	27.0 µg/m³	24h	4
2026-05-25	77	3–170	26.8 µg/m³	24h	4
2026-05-24	91	18–156	32.0 µg/m³	24h	4
2026-05-23	82	14–160	28.2 µg/m³	24h	4
2026-05-22	67	17–177	23.8 µg/m³	24h	3
2026-05-21	79	10–184	32.1 µg/m³	24h	4
2026-05-20	70	8–171	25.4 µg/m³	13h	3

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