Imperial County, California

AQI 64 · Moderate

YearMonth

64

Median AQI

108

90th Percentile

190

Max AQI

219

Days with Data

Ranked #43 of 46 counties in California (by median AQI, lower is better)

Monthly Median AQI — 2025

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AQI Category Breakdown

Adjacent Counties

La Paz County, Arizona Yuma County, Arizona Riverside County San Diego County

External Links

Imperial County, California on Wikipedia