Your local guide
Regional air-quality reports for Thousand Oaks, with times and official source links.
AIRNOW · THOUSAND OAKS
Checking the latest regional report…
Regional observations from AirNow’s Thousand Oaks reporting area. 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
52%
191 of 366 days
Median AQI
50
Good
Unhealthy-for-sensitive days or worse
15
Main pollutant
Ozone
247 days
Worst reading
AQI 176
Unhealthy
Average daily AQI for each month, 2022–2024. January is usually the cleanest month and July 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, 52% of days had good air (AQI 50 or below) at Ventura County monitors, 44% were moderate and 15 days reached unhealthy for sensitive groups or worse. The median AQI was 50.
From 2022 to 2024, July had the highest average AQI (72) and January the lowest (42).
ozone (smog) was the main pollutant on 247 of 366 days in 2024.
The median AQI was 56 in 2015 and 50 in 2024; days at unhealthy for sensitive groups or worse went from 13 to 15.
Source: U.S. EPA AirData, annual and daily AQI by county, Ventura 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.