What is the air quality trend in Marlborough?

Over the past 8 days, Marlborough had an average AQI of 69 based on station measurements. The worst day was 2026-07-17 with AQI 124.

How is Marlborough air quality measured?

Air quality in Marlborough 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 Marlborough, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Marlborough, 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 · 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	43	25–58	10.5 µg/m³	13.0	23h	7
2026-07-20	58	30–188	18.7 µg/m³	5.8	24h	8
2026-07-19	57	26–169	17.0 µg/m³	21.6	24h	9
2026-07-18	73	34–127	23.0 µg/m³	46.7	24h	8
2026-07-17	124	40–210	56.9 µg/m³	4.1	24h	9
2026-07-16	70	30–196	25.3 µg/m³	—	24h	7
2026-07-15	56	39–86	14.7 µg/m³	26.6	24h	8
2026-07-14	75	75–75	23.4 µg/m³	24.1	1h	1

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