What is the air quality trend in Marlborough?

Over the past 15 days, Marlborough had an average AQI of 52 based on station measurements. The worst day was 2026-07-17 with AQI 122.

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

335h

PM2.5 Station

335h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	34	26–46	8.1 µg/m³	5h	6
2026-07-21	47	26–61	11.8 µg/m³	24h	9
2026-07-20	52	22–170	15.6 µg/m³	24h	9
2026-07-19	50	28–88	13.2 µg/m³	24h	10
2026-07-18	78	21–127	25.1 µg/m³	24h	10
2026-07-17	122	20–228	55.7 µg/m³	24h	10
2026-07-16	71	35–155	22.1 µg/m³	24h	8
2026-07-15	65	34–172	20.2 µg/m³	24h	9
2026-07-14	46	34–57	11.0 µg/m³	24h	10
2026-07-13	38	23–52	9.0 µg/m³	24h	9
2026-07-12	44	21–169	12.5 µg/m³	24h	9
2026-07-11	40	28–53	9.7 µg/m³	24h	10
2026-07-10	35	24–54	8.5 µg/m³	24h	8
2026-07-09	35	24–46	8.5 µg/m³	24h	7
2026-07-08	35	23–46	8.4 µg/m³	18h	8

Back to Marlborough Air Quality