What is the air quality trend in La Unión?

Over the past 20 days, La Unión had an average AQI of 106 based on station measurements. The worst day was 2026-07-21 with AQI 192.

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.

286

Current AQI
Very unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

403h

PM2.5 Station

403h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	192	8–431	136.2 µg/m³	17h	1
2026-07-20	105	23–235	47.4 µg/m³	19h	2
2026-07-19	74	8–161	24.5 µg/m³	23h	1
2026-07-18	64	21–122	19.2 µg/m³	23h	1
2026-07-17	70	12–168	23.1 µg/m³	22h	1
2026-07-16	47	4–70	12.3 µg/m³	22h	1
2026-07-15	68	17–142	21.5 µg/m³	22h	1
2026-07-14	93	29–165	33.2 µg/m³	19h	1
2026-07-13	52	12–104	14.7 µg/m³	19h	1
2026-07-12	120	50–324	60.7 µg/m³	20h	1
2026-07-11	155	13–456	97.7 µg/m³	23h	1
2026-07-10	103	13–291	50.5 µg/m³	23h	1
2026-07-09	102	4–203	43.3 µg/m³	19h	1
2026-07-08	50	8–87	13.7 µg/m³	24h	1
2026-07-07	64	12–304	25.9 µg/m³	23h	1
2026-07-06	159	9–425	98.6 µg/m³	10h	2
2026-07-05	148	5–307	101.1 µg/m³	19h	1
2026-07-04	180	24–495	122.9 µg/m³	23h	2
2026-07-03	171	17–422	116.7 µg/m³	23h	2
2026-07-02	109	46–321	59.1 µg/m³	10h	1

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