What is the air quality trend in Keene?

Over the past 7 days, Keene had an average AQI of 66 based on station measurements. The worst day was 2026-07-17 with AQI 112.

How is Keene air quality measured?

Air quality in Keene 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 Keene, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

154h

PM2.5 Station

154h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	47	25–93	12.3 µg/m³	19h	2
2026-07-20	49	4–91	13.8 µg/m³	22h	2
2026-07-19	55	23–208	19.5 µg/m³	22h	2
2026-07-18	80	13–171	30.3 µg/m³	23h	2
2026-07-17	112	20–366	59.5 µg/m³	24h	2
2026-07-16	72	5–199	32.3 µg/m³	23h	2
2026-07-15	51	12–272	22.0 µg/m³	21h	2

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