What is the air quality trend in Redwood City?

Over the past 7 days, Redwood City had an average AQI of 35 based on station measurements. The worst day was 2026-08-03 with AQI 45.

How is Redwood City air quality measured?

Air quality in Redwood City 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 Redwood City, United States

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 101 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-07	33	23–42	7.9 µg/m³	5.5	23h	101
2026-08-06	33	28–59	8.0 µg/m³	5.1	24h	97
2026-08-05	36	32–40	8.7 µg/m³	7.0	24h	96
2026-08-04	40	33–48	9.6 µg/m³	7.9	24h	98
2026-08-03	45	35–53	10.8 µg/m³	15.9	24h	93
2026-08-02	34	29–39	8.2 µg/m³	9.9	24h	99
2026-08-01	29	25–34	6.9 µg/m³	5.3	22h	98

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