What is the air quality trend in San Jose?

Over the past 17 days, San Jose had an average AQI of 24 based on station measurements. The worst day was with AQI .

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
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

305h · 76 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-04-11	13	13–13	3.1 µg/m³	2h	76
2026-04-10	13	12–14	3.1 µg/m³	24h	77
2026-04-09	18	15–20	4.3 µg/m³	16h	77
2026-04-08	27	24–44	6.5 µg/m³	9h	68
2026-04-07	25	23–27	6.0 µg/m³	24h	76
2026-04-06	27	20–33	6.5 µg/m³	18h	76
2026-04-04	20	16–23	4.7 µg/m³	14h	76
2026-04-03	19	16–22	4.5 µg/m³	24h	76
2026-04-02	16	11–24	3.9 µg/m³	22h	73
2026-04-01	29	20–34	7.0 µg/m³	21h	76
2026-03-31	35	32–37	8.3 µg/m³	21h	77
2026-03-30	40	37–44	9.7 µg/m³	10h	77
2026-03-29	36	30–41	8.7 µg/m³	23h	77
2026-03-28	29	21–34	7.0 µg/m³	22h	77
2026-03-27	24	19–30	5.8 µg/m³	24h	77
2026-03-26	24	20–27	5.8 µg/m³	24h	77
2026-03-25	20	18–22	4.9 µg/m³	7h	77

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