What is the air quality trend in San Jose?

Over the past 15 days, San Jose had an average AQI of 31 based on station measurements. The worst day was 2026-08-03 with AQI 46.

How is San Jose air quality measured?

Air quality in San Jose 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 Jose, United States

Name: San Jose 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 Jose, United States.

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 76 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	35	34–37	8.5 µg/m³	5h	77
2026-08-07	34	25–42	8.1 µg/m³	24h	78
2026-08-06	35	29–59	8.5 µg/m³	24h	73
2026-08-05	36	32–40	8.6 µg/m³	24h	72
2026-08-04	41	33–48	9.8 µg/m³	24h	74
2026-08-03	46	37–62	11.1 µg/m³	24h	71
2026-08-02	34	30–39	8.2 µg/m³	24h	76
2026-08-01	31	26–39	7.5 µg/m³	24h	75
2026-07-31	37	30–55	8.9 µg/m³	24h	75
2026-07-30	31	26–35	7.4 µg/m³	24h	76
2026-07-29	24	20–28	5.6 µg/m³	24h	75
2026-07-28	28	25–36	6.8 µg/m³	24h	76
2026-07-27	20	17–26	4.7 µg/m³	24h	83
2026-07-26	19	17–25	4.6 µg/m³	24h	83
2026-07-25	28	25–30	6.7 µg/m³	16h	82

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