What is the air quality trend in Santiago?

Over the past 7 days, Santiago had an average AQI of 134 based on station measurements. The worst day was 2026-05-24 with AQI 173.

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.

153

Current AQI
Unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 85 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	136	111–157	50.4 µg/m³	0.2	24h	84
2026-05-28	119	86–146	42.8 µg/m³	0.2	24h	84
2026-05-27	120	96–155	43.5 µg/m³	0.1	24h	85
2026-05-26	84	48–143	27.4 µg/m³	0.0	24h	82
2026-05-25	143	90–184	66.7 µg/m³	0.1	24h	82
2026-05-24	173	166–187	98.7 µg/m³	0.4	24h	83
2026-05-23	165	155–176	83.4 µg/m³	0.4	24h	85

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