What is the air quality trend in Milpitas?

Over the past 8 days, Milpitas had an average AQI of 26 based on station measurements. The worst day was 2026-10-18 with AQI 34.

How is Milpitas air quality measured?

Air quality in Milpitas 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 Milpitas, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 108 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	21	17–53	5.1 µg/m³	8.7	20h	94
2026-10-19	23	20–28	5.5 µg/m³	15.5	24h	109
2026-10-18	34	25–39	8.1 µg/m³	20.6	24h	101
2026-10-17	29	24–34	7.0 µg/m³	21.0	24h	111
2026-10-16	31	23–53	7.5 µg/m³	20.1	24h	106
2026-10-15	29	25–34	6.9 µg/m³	20.3	24h	114
2026-10-14	24	20–29	5.8 µg/m³	18.5	24h	115
2026-10-13	18	18–19	4.5 µg/m³	17.5	2h	114

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