Your local guide
Regional air-quality information for Antioch, with times and official source links.
AIRNOW · CONCORD REPORTING AREA (REGIONAL OBSERVATION)
Checking the latest report…
Regional observations from AirNow and the linked official reporting source. This is an area report, not a monitor on your street.
Check a local allergy forecast for pollen levels. Air quality and pollen measure different things.
Days with good air
54%
195 of 363 days
Median AQI
48
Good
Unhealthy-for-sensitive days or worse
0
Main pollutant
PM2.5
351 days
Worst reading
AQI 99
Moderate
Average daily AQI for each month, 2022–2024. March is usually the cleanest month and December the worst.
Bars show days each year at “unhealthy for sensitive groups” (AQI above 100) or worse.
Ozone forms on hot, sunny afternoons, so it peaks in summer; plan runs and outdoor play for the morning on high-ozone days. Fine particles (PM2.5) come from wildfire smoke, traffic and wood burning and can spike in any season. Above 100, people with asthma, heart or lung conditions, older adults and children should limit long or heavy exertion outdoors.
In 2024, 54% of days had good air (AQI 50 or below) at Contra Costa County monitors, 46% were moderate and 0 days reached unhealthy for sensitive groups or worse. The median AQI was 48.
From 2022 to 2024, December had the highest average AQI (56) and March the lowest (39).
fine particles (PM2.5) was the main pollutant on 351 of 363 days in 2024.
The median AQI was 48 in 2015 and 48 in 2024; days at unhealthy for sensitive groups or worse went from 8 to 0.
Source: U.S. EPA AirData, annual and daily AQI by county, Contra Costa County, California. County figures use the highest reading among the county’s monitors each day.
Air quality can vary within the reporting area. Use AirNow’s guidance and current reports when planning outdoor activity.
Open AirNow →Check weather and wind alongside the AQI. Pollen is a separate measurement and is not connected yet.
Local weather →Hours and availability change, so check with each place before you go.