What is the air quality trend in Rialto?

Over the past 8 days, Rialto had an average AQI of 35 based on station measurements. The worst day was 2026-05-22 with AQI 47.

How is Rialto air quality measured?

Air quality in Rialto 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 Rialto, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 15 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	20	17–23	4.8 µg/m³	21h	13
2026-05-27	23	18–29	5.5 µg/m³	24h	13
2026-05-26	25	21–31	6.1 µg/m³	24h	13
2026-05-25	33	25–45	7.9 µg/m³	24h	13
2026-05-24	47	30–56	11.6 µg/m³	24h	12
2026-05-23	44	35–55	10.7 µg/m³	24h	12
2026-05-22	47	25–58	11.5 µg/m³	24h	13
2026-05-21	46	46–46	10.9 µg/m³	1h	15

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