What is the air quality trend in Acton?

Over the past 8 days, Acton had an average AQI of 65 based on station measurements. The worst day was 2026-07-17 with AQI 116.

How is Acton air quality measured?

Air quality in Acton 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 Acton, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Acton, 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 · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	24	18–31	6.0 µg/m³	3.1	2h	5
2026-07-21	47	29–74	11.9 µg/m³	13.1	24h	9
2026-07-20	57	25–171	17.4 µg/m³	5.8	24h	10
2026-07-19	56	33–72	15.0 µg/m³	21.6	24h	12
2026-07-18	82	27–143	26.7 µg/m³	46.7	24h	11
2026-07-17	116	33–181	47.5 µg/m³	4.1	24h	11
2026-07-16	88	38–196	35.3 µg/m³	—	24h	10
2026-07-15	57	35–102	15.4 µg/m³	26.9	22h	11

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