When it's worst
Late afternoon on hot, still summer days — ozone builds inland while the marine layer sits offshore.
Live
Garden Grove air quality
Orange County air changes fast — inversion layers, 22 freeway traffic and fire season all show up here first.
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Fire season
Santa Ana winds in October and November can push smoke across Orange County overnight. Check before a morning run.
Best air
Mornings after a marine layer, and the day right after rain — the cleanest air Garden Grove gets.