What is the air quality trend in Fontana?

Over the past 15 days, Fontana had an average AQI of 40 based on station measurements. The worst day was 2026-05-20 with AQI 67.

How is Fontana air quality measured?

Air quality in Fontana 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 Fontana, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 15 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	21	18–32	5.2 µg/m³	15h	13
2026-05-28	22	16–60	5.4 µg/m³	24h	12
2026-05-27	22	18–32	5.4 µg/m³	24h	12
2026-05-26	25	20–34	6.1 µg/m³	24h	12
2026-05-25	32	25–41	7.7 µg/m³	24h	12
2026-05-24	46	33–56	11.2 µg/m³	24h	12
2026-05-23	45	36–54	10.8 µg/m³	24h	11
2026-05-22	46	29–58	11.3 µg/m³	24h	12
2026-05-21	49	40–58	12.0 µg/m³	24h	13
2026-05-20	67	40–83	20.0 µg/m³	24h	12
2026-05-19	54	31–68	14.4 µg/m³	24h	13
2026-05-18	52	36–61	13.2 µg/m³	24h	13
2026-05-17	50	35–61	12.8 µg/m³	24h	12
2026-05-16	36	32–42	8.5 µg/m³	24h	11
2026-05-15	46	42–48	11.0 µg/m³	7h	12

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