What is the air quality trend in Rancagua?

Over the past 20 days, Rancagua had an average AQI of 63 based on station measurements. The worst day was 2026-05-20 with AQI 95.

How is Rancagua air quality measured?

Air quality in Rancagua 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 Rancagua, Chile

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

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

154

Current AQI
Unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

457h

PM2.5 Station

457h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	65	3–154	19.9 µg/m³	23h	3
2026-05-28	52	23–142	14.7 µg/m³	22h	3
2026-05-27	68	9–179	25.3 µg/m³	24h	2
2026-05-26	59	2–174	19.9 µg/m³	23h	3
2026-05-25	75	23–170	25.8 µg/m³	24h	3
2026-05-24	60	23–154	18.9 µg/m³	24h	4
2026-05-23	80	15–168	28.1 µg/m³	22h	3
2026-05-22	51	7–153	15.8 µg/m³	22h	3
2026-05-21	68	16–196	24.3 µg/m³	23h	3
2026-05-20	95	15–500	63.3 µg/m³	22h	3
2026-05-19	61	12–160	19.3 µg/m³	22h	3
2026-05-18	54	3–101	16.7 µg/m³	22h	2
2026-05-17	66	8–211	28.0 µg/m³	22h	2
2026-05-16	58	15–221	22.4 µg/m³	23h	3
2026-05-15	63	16–243	24.0 µg/m³	24h	4
2026-05-14	51	13–134	14.6 µg/m³	23h	4
2026-05-13	56	8–116	16.5 µg/m³	24h	4
2026-05-12	57	5–126	17.0 µg/m³	24h	4
2026-05-11	63	13–181	21.2 µg/m³	23h	4
2026-05-10	65	22–160	20.5 µg/m³	21h	4

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