What is the air quality trend in Dorchester?

Over the past 7 days, Dorchester had an average AQI of 56 based on station measurements. The worst day was 2026-07-18 with AQI 98.

How is Dorchester air quality measured?

Air quality in Dorchester 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 Dorchester, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

113h

PM2.5 Station

113h · 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	45	20–85	12.3 µg/m³	12.7	21h	1
2026-07-20	24	10–60	5.9 µg/m³	5.8	24h	1
2026-07-19	59	8–161	19.6 µg/m³	21.6	24h	1
2026-07-18	98	13–173	42.6 µg/m³	46.7	24h	1
2026-07-17	16	10–23	3.9 µg/m³	4.1	8h	1
2026-07-15	78	67–98	25.0 µg/m³	26.4	9h	1
2026-07-14	72	69–75	21.9 µg/m³	22.2	3h	1

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