What is the air quality trend in Cupertino?

Over the past 7 days, Cupertino had an average AQI of 26 based on station measurements. The worst day was 2026-10-18 with AQI 31.

How is Cupertino air quality measured?

Air quality in Cupertino 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 Cupertino, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 68 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	16–63	5.1 µg/m³	2.2	24h	60
2026-10-19	23	20–28	5.5 µg/m³	1.6	24h	67
2026-10-18	31	24–36	7.5 µg/m³	4.3	24h	63
2026-10-17	27	21–30	6.5 µg/m³	5.1	24h	70
2026-10-16	28	12–34	6.6 µg/m³	4.7	24h	66
2026-10-15	28	25–33	6.8 µg/m³	4.3	24h	73
2026-10-14	24	21–31	5.8 µg/m³	4.7	21h	73

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