What is the air quality trend in Westchester?

Over the past 15 days, Westchester had an average AQI of 36 based on station measurements. The worst day was 2026-07-16 with AQI 48.

How is Westchester air quality measured?

Air quality in Westchester 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 Westchester, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

327h

PM2.5 Station

327h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	27	27–27	6.5 µg/m³	1h	1
2026-07-21	34	15–62	8.4 µg/m³	24h	2
2026-07-20	47	30–90	12.2 µg/m³	24h	2
2026-07-19	41	19–160	11.9 µg/m³	24h	2
2026-07-18	43	22–116	11.4 µg/m³	24h	2
2026-07-17	43	24–157	11.7 µg/m³	24h	2
2026-07-16	48	34–154	12.8 µg/m³	23h	2
2026-07-15	29	21–50	7.1 µg/m³	23h	2
2026-07-14	30	16–74	7.3 µg/m³	24h	2
2026-07-13	38	23–78	9.3 µg/m³	24h	1
2026-07-12	36	8–92	9.3 µg/m³	23h	2
2026-07-11	26	13–55	6.3 µg/m³	21h	2
2026-07-10	34	24–47	8.1 µg/m³	23h	2
2026-07-09	35	22–53	8.3 µg/m³	23h	2
2026-07-08	39	21–62	9.6 µg/m³	22h	2

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