What is the air quality trend in Fairfield?

Over the past 8 days, Fairfield had an average AQI of 61 based on station measurements. The worst day was 2026-07-17 with AQI 110.

How is Fairfield air quality measured?

Air quality in Fairfield 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 Fairfield, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

150h

PM2.5 Station

150h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	43	43–43	10.3 µg/m³	1h	5
2026-07-21	54	36–75	14.2 µg/m³	20h	3
2026-07-20	64	16–104	19.0 µg/m³	20h	3
2026-07-19	60	28–112	17.2 µg/m³	19h	4
2026-07-18	55	9–104	15.3 µg/m³	21h	4
2026-07-17	110	45–181	42.5 µg/m³	24h	4
2026-07-16	64	30–165	20.7 µg/m³	23h	4
2026-07-15	44	23–73	10.8 µg/m³	22h	4

Back to Fairfield Air Quality