What is the air quality trend in Fountain Valley?

Over the past 8 days, Fountain Valley had an average AQI of 25 based on station measurements. The worst day was 2026-10-20 with AQI 33.

How is Fountain Valley air quality measured?

Air quality in Fountain Valley 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 Fountain Valley, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 133 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	23	22–24	5.4 µg/m³	3.2	8h	133
2026-10-20	33	13–43	8.0 µg/m³	5.8	24h	120
2026-10-19	28	21–35	6.8 µg/m³	4.3	24h	136
2026-10-18	25	20–33	5.9 µg/m³	3.7	24h	126
2026-10-17	24	15–31	5.8 µg/m³	3.8	24h	135
2026-10-16	24	15–34	5.9 µg/m³	3.8	24h	129
2026-10-15	26	17–35	6.2 µg/m³	4.2	24h	135
2026-10-14	24	18–28	5.7 µg/m³	3.7	14h	134

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