What is the air quality trend in Rancho Cucamonga?

Over the past 8 days, Rancho Cucamonga had an average AQI of 43 based on station measurements. The worst day was 2026-06-05 with AQI 51.

How is Rancho Cucamonga air quality measured?

Air quality in Rancho Cucamonga 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 Rancho Cucamonga, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-06-09	37	33–40	8.9 µg/m³	8.8	8h	12
2026-06-08	36	26–52	8.7 µg/m³	10.5	24h	14
2026-06-07	35	25–42	8.3 µg/m³	10.2	24h	15
2026-06-06	44	33–55	10.5 µg/m³	16.9	24h	15
2026-06-05	51	40–59	12.7 µg/m³	28.9	24h	15
2026-06-04	46	34–61	11.2 µg/m³	20.0	24h	16
2026-06-03	47	30–59	11.8 µg/m³	17.5	24h	15
2026-06-02	50	31–60	12.2 µg/m³	20.4	16h	16

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