What is the air quality trend in Santiago?

Over the past 8 days, Santiago had an average AQI of 51 based on station measurements. The worst day was 2026-09-05 with AQI 84.

How is Santiago air quality measured?

Air quality in Santiago 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 Santiago, Chile

Name: Santiago Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Santiago, Chile.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 79 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-05	84	56–95	28.0 µg/m³	0.0	12h	79
2026-09-04	51	22–80	14.3 µg/m³	0.0	24h	80
2026-09-03	43	16–77	11.6 µg/m³	0.0	24h	78
2026-09-02	65	14–100	20.4 µg/m³	0.1	24h	80
2026-09-01	58	33–76	15.8 µg/m³	0.0	23h	80
2026-08-31	23	9–47	5.6 µg/m³	0.0	24h	74
2026-08-30	52	16–85	14.6 µg/m³	0.0	24h	79
2026-08-29	37	18–74	9.9 µg/m³	0.0	11h	79

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