What is the air quality trend in Vacaville?

Over the past 8 days, Vacaville had an average AQI of 27 based on station measurements. The worst day was 2026-07-17 with AQI 31.

How is Vacaville air quality measured?

Air quality in Vacaville 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 Vacaville, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 36 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	28	18–55	6.7 µg/m³	20h	37
2026-07-20	26	19–60	6.4 µg/m³	24h	36
2026-07-19	28	23–59	6.7 µg/m³	24h	37
2026-07-18	30	24–54	7.3 µg/m³	24h	39
2026-07-17	31	23–37	7.4 µg/m³	24h	39
2026-07-16	29	21–54	7.1 µg/m³	24h	36
2026-07-15	26	19–45	6.3 µg/m³	24h	37
2026-07-14	25	23–27	6.0 µg/m³	3h	39

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