What is the air quality trend in Alum Rock?

Over the past 2 days, Alum Rock had an average AQI of 28 based on station measurements. The worst day was 2026-07-21 with AQI 31.

How is Alum Rock air quality measured?

Air quality in Alum Rock 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 Alum Rock, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

47h

PM2.5 Station

47h · 79 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	31	24–56	7.4 µg/m³	23h	76
2026-07-20	26	19–75	6.5 µg/m³	24h	72

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