What is the air quality trend in West Chester?

Over the past 7 days, West Chester had an average AQI of 96 based on station measurements. The worst day was 2026-07-17 with AQI 181.

How is West Chester air quality measured?

Air quality in West Chester is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for West Chester, United States

Name: West Chester Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near West Chester, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 7 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	54	31–65	14.2 µg/m³	22.5	24h	83
2026-07-20	49	31–69	12.6 µg/m³	13.1	24h	83
2026-07-19	56	25–73	15.8 µg/m³	26.2	24h	86
2026-07-18	139	70–165	60.0 µg/m³	95.6	24h	86
2026-07-17	181	158–221	110.7 µg/m³	143.8	24h	92
2026-07-16	136	60–165	52.2 µg/m³	96.1	24h	85
2026-07-15	57	52–76	14.9 µg/m³	23.1	24h	89

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