What is the air quality trend in Marlborough?

Over the past 8 days, Marlborough had an average AQI of 62 based on station measurements. The worst day was 2026-07-17 with AQI 114.

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
2026-07-22	20	20–20	4.8 µg/m³	5.0	1h	1
2026-07-21	46	30–68	11.4 µg/m³	13.1	24h	10
2026-07-20	56	28–168	16.5 µg/m³	5.8	24h	11
2026-07-19	55	35–83	14.4 µg/m³	21.6	24h	11
2026-07-18	71	27–104	22.2 µg/m³	46.7	24h	11
2026-07-17	114	33–198	50.5 µg/m³	4.1	24h	11
2026-07-16	82	38–179	29.9 µg/m³	—	24h	10
2026-07-15	56	30–103	14.9 µg/m³	27.1	23h	11

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