Placer County, California
AQI 51 · Moderate51
Median AQI
74
90th Percentile
143
Max AQI
243
Days with Data
Ranked #33 of 46 counties in California (by median AQI, lower is better)
Monthly Median AQI — 2025
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51
Median AQI
74
90th Percentile
143
Max AQI
243
Days with Data
Ranked #33 of 46 counties in California (by median AQI, lower is better)
Click a bar to view that month's details