What is the air quality trend in Vacaville?

Over the past 15 days, Vacaville had an average AQI of 31 based on station measurements. The worst day was 2026-07-31 with AQI 55.

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
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 36 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	31	30–32	7.5 µg/m³	2h	34
2026-08-07	26	21–32	6.3 µg/m³	24h	35
2026-08-06	33	25–61	8.0 µg/m³	24h	34
2026-08-05	38	31–55	9.2 µg/m³	24h	33
2026-08-04	35	27–42	8.4 µg/m³	24h	33
2026-08-03	37	31–48	9.0 µg/m³	24h	32
2026-08-02	36	28–45	8.7 µg/m³	24h	35
2026-08-01	38	28–55	9.2 µg/m³	24h	35
2026-07-31	55	24–69	15.0 µg/m³	24h	35
2026-07-30	28	21–37	6.6 µg/m³	24h	34
2026-07-29	24	20–26	5.6 µg/m³	24h	36
2026-07-28	26	21–33	6.2 µg/m³	24h	36
2026-07-27	21	17–27	5.0 µg/m³	24h	39
2026-07-26	23	18–38	5.6 µg/m³	24h	39
2026-07-25	27	20–33	6.4 µg/m³	19h	39

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