What is the air quality trend in La Unión?

Over the past 20 days, La Unión had an average AQI of 88 based on station measurements. The worst day was 2026-05-26 with AQI 156.

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.

189

Current AQI
Unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

445h

PM2.5 Station

445h · 3 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	114	27–199	49.1 µg/m³	22h	2
2026-05-28	73	20–187	27.2 µg/m³	24h	2
2026-05-27	141	52–226	68.4 µg/m³	21h	2
2026-05-26	156	54–297	84.7 µg/m³	24h	2
2026-05-25	90	32–182	34.3 µg/m³	24h	3
2026-05-24	92	46–170	34.5 µg/m³	24h	2
2026-05-23	131	60–439	69.0 µg/m³	22h	2
2026-05-22	146	10–414	84.3 µg/m³	23h	2
2026-05-21	121	16–365	63.5 µg/m³	22h	2
2026-05-20	112	25–263	56.1 µg/m³	24h	2
2026-05-19	64	12–175	20.9 µg/m³	24h	2
2026-05-18	114	14–223	58.6 µg/m³	24h	2
2026-05-17	75	11–204	28.3 µg/m³	21h	2
2026-05-16	43	3–91	11.7 µg/m³	21h	2
2026-05-15	40	8–86	10.5 µg/m³	21h	2
2026-05-14	47	4–165	16.0 µg/m³	23h	2
2026-05-13	61	9–170	20.0 µg/m³	20h	2
2026-05-12	49	9–116	14.3 µg/m³	22h	2
2026-05-11	58	12–200	21.5 µg/m³	22h	2
2026-05-10	46	3–115	13.1 µg/m³	17h	2

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