Lancaster County, Pennsylvania

AQI 46 · Good

YearMonth

46

Median AQI

72

90th Percentile

119

Max AQI

210

Days with Data

Ranked #34 of 37 counties in Pennsylvania (by median AQI, lower is better)

Monthly Median AQI — 2025

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AQI Category Breakdown

Adjacent Counties

Cecil County, Maryland Harford County, Maryland Berks County Chester County Dauphin County Lebanon County York County

External Links

Lancaster County, Pennsylvania on Wikipedia