Daily air tracker
Chino Hills air quality
Inland Empire air can swing fast with freeway traffic, wildfire smoke and inland heat. Here's today's reading and what to do about it.
Updated daily
Chino Hills air quality & pollen
Live U.S. AQI for the South Bay with particulate readings, the next 24-hour peak, and what it means for your day.
Why the Inland Empire differs
Trapped valley air along SR-71, SR-60 and SR-91 plus inland heat push particulate and ozone levels above the coastal average on still days.
Best air of the day
Mornings before 9 AM usually have the lowest ozone — the sweet spot for a walk at Chino Hills State Park.
Wildfire season
During Santa Ana events, AQI can jump 100+ points in hours. Check before outdoor sports practice.