What is the air quality trend in San Dimas?

Over the past 3 days, San Dimas had an average AQI of 25 based on station measurements. The worst day was 2026-10-20 with AQI 33.

How is San Dimas air quality measured?

Air quality in San Dimas 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 San Dimas, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

46h

PM2.5 Station

46h · 107 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	33	17–42	7.9 µg/m³	4.8	21h	91
2026-10-19	29	21–36	6.9 µg/m³	2.8	24h	106
2026-10-18	13	13–13	3.2 µg/m³	2.6	1h	4

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