What is the air quality trend in Westford?

Over the past 8 days, Westford had an average AQI of 69 based on station measurements. The worst day was 2026-07-17 with AQI 130.

How is Westford air quality measured?

Air quality in Westford 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 Westford, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 1 station

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	44	28–59	10.7 µg/m³	12.8	22h	7
2026-07-20	62	24–220	22.8 µg/m³	5.8	24h	8
2026-07-19	52	27–99	14.1 µg/m³	21.6	24h	9
2026-07-18	72	23–131	22.6 µg/m³	46.7	24h	8
2026-07-17	130	53–174	51.8 µg/m³	4.1	24h	8
2026-07-16	76	38–175	26.2 µg/m³	—	24h	8
2026-07-15	58	38–153	15.9 µg/m³	26.6	24h	8
2026-07-14	62	52–71	17.2 µg/m³	22.9	2h	4

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