What is the air quality trend in La Unión?

Over the past 21 days, La Unión had an average AQI of 68 based on station measurements. The worst day was 2026-08-23 with AQI 106.

How is La Unión air quality measured?

Air quality in La Unión 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 La Unión, Chile

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

469h

PM2.5 Station

469h · 3 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	64	31–151	19.5 µg/m³	12h	4
2026-09-04	53	25–157	15.6 µg/m³	24h	3
2026-09-03	41	14–70	10.7 µg/m³	24h	4
2026-09-02	57	18–168	17.8 µg/m³	23h	4
2026-09-01	70	16–168	23.8 µg/m³	24h	4
2026-08-31	77	13–154	25.0 µg/m³	24h	3
2026-08-30	69	23–168	22.9 µg/m³	23h	3
2026-08-29	51	18–114	14.1 µg/m³	23h	3
2026-08-28	55	15–85	15.5 µg/m³	24h	3
2026-08-27	66	21–157	20.6 µg/m³	23h	4
2026-08-26	50	17–119	13.4 µg/m³	24h	3
2026-08-25	51	17–140	14.0 µg/m³	24h	4
2026-08-24	99	25–254	43.6 µg/m³	23h	3
2026-08-23	106	29–186	45.1 µg/m³	24h	3
2026-08-22	90	50–170	31.2 µg/m³	22h	4
2026-08-21	69	36–154	21.2 µg/m³	24h	4
2026-08-20	64	21–155	19.7 µg/m³	24h	3
2026-08-19	94	37–224	41.8 µg/m³	23h	3
2026-08-18	90	25–187	35.0 µg/m³	24h	4
2026-08-17	59	23–131	17.4 µg/m³	24h	4
2026-08-16	58	20–137	17.3 µg/m³	9h	4

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