What is the air quality trend in Four Corners?

Over the past 8 days, Four Corners had an average AQI of 33 based on station measurements. The worst day was 2026-10-19 with AQI 47.

How is Four Corners air quality measured?

Air quality in Four Corners 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 Four Corners, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Four Corners, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

145h

PM2.5 Station

145h · 2 stations

Temperature GFS model

27pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	26	15–49	6.2 µg/m³	4h	2
2026-10-20	30	5–59	7.4 µg/m³	21h	2
2026-10-19	47	15–132	13.4 µg/m³	20h	2
2026-10-18	33	13–86	8.5 µg/m³	22h	2
2026-10-17	34	5–195	12.4 µg/m³	22h	2
2026-10-16	31	5–171	10.2 µg/m³	22h	2
2026-10-15	22	5–58	5.3 µg/m³	21h	2
2026-10-14	42	9–102	11.6 µg/m³	13h	2

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