What is the air quality trend in Fontana?

Over the past 14 days, Fontana had an average AQI of 49 based on station measurements. The worst day was 2026-08-04 with AQI 63.

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
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 10 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-07	48	35–71	12.2 µg/m³	24h	8
2026-08-06	52	38–103	13.7 µg/m³	24h	8
2026-08-05	61	32–133	17.8 µg/m³	24h	8
2026-08-04	63	30–156	18.8 µg/m³	24h	8
2026-08-03	47	24–88	12.0 µg/m³	24h	7
2026-08-02	43	27–57	10.4 µg/m³	24h	8
2026-08-01	51	37–62	12.7 µg/m³	24h	8
2026-07-31	46	34–57	11.2 µg/m³	24h	8
2026-07-30	49	32–64	12.4 µg/m³	24h	7
2026-07-29	49	39–63	12.3 µg/m³	24h	9
2026-07-28	53	25–191	16.7 µg/m³	24h	8
2026-07-27	42	31–52	10.0 µg/m³	24h	7
2026-07-26	42	29–56	10.1 µg/m³	24h	8
2026-07-25	41	31–58	10.0 µg/m³	21h	9

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