What is the air quality trend in La Unión?

Over the past 15 days, La Unión had an average AQI of 71 based on station measurements. The worst day was 2026-07-21 with AQI 128.

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

322h

PM2.5 Station

322h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	128	6–311	74.0 µg/m³	21h	2
2026-07-20	76	28–159	25.7 µg/m³	24h	2
2026-07-19	61	25–130	17.7 µg/m³	23h	3
2026-07-18	56	29–102	15.5 µg/m³	22h	2
2026-07-17	70	42–158	21.7 µg/m³	23h	3
2026-07-16	57	33–137	15.6 µg/m³	24h	3
2026-07-15	64	26–142	19.1 µg/m³	23h	2
2026-07-14	71	27–158	22.8 µg/m³	22h	3
2026-07-13	50	21–88	13.5 µg/m³	23h	2
2026-07-12	84	1–196	31.8 µg/m³	21h	3
2026-07-11	111	32–220	53.1 µg/m³	24h	3
2026-07-10	84	39–178	30.4 µg/m³	24h	3
2026-07-09	71	18–144	22.4 µg/m³	23h	3
2026-07-08	44	11–67	10.9 µg/m³	24h	3
2026-07-07	44	44–44	10.6 µg/m³	1h	3

Back to La Unión Air Quality