Stay updated with real-time air quality in Keene, New Hampshire featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
56
Moderate
Keene, New Hampshire
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
11.60 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
50.99 μg/m³
0
55
155
255
425
605+
27.00 ppb
0
55
71
86
201
201+
0.38 ppb
0
36
76
186
605
1005+
1.88 ppb
0
54
101
361
1250
2050+
0.11 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Keene, New Hampshire
Keene, New Hampshire
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AQI 54
Moderate
11.09μg/m³
PM2.5
31.28μg/m³
PM10
28.97ppb
O3
0.23ppb
SO2
2.76ppb
NO2
0.11ppm
CO
AQI 56
Moderate
12.35μg/m³
PM2.5
37.73μg/m³
PM10
31.23ppb
O3
0.40ppb
SO2
3.00ppb
NO2
0.12ppm
CO
AQI 56
Moderate
11.68μg/m³
PM2.5
38.03μg/m³
PM10
30.64ppb
O3
0.38ppb
SO2
2.83ppb
NO2
0.11ppm
CO
AQI 56
Moderate
11.57μg/m³
PM2.5
41.99μg/m³
PM10
29.56ppb
O3
0.38ppb
SO2
3.12ppb
NO2
0.13ppm
CO
AQI 56
Moderate
12.30μg/m³
PM2.5
54.99μg/m³
PM10
23.00ppb
O3
0.34ppb
SO2
2.80ppb
NO2
0.13ppm
CO
AQI 56
Moderate
11.88μg/m³
PM2.5
37.52μg/m³
PM10
28.95ppb
O3
0.37ppb
SO2
2.88ppb
NO2
0.11ppm
CO
Air quality measurements for New Hampshire, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Keene, New Hampshire is updated on an hourly basis.
The worst air quality in Keene, New Hampshire was recorded at 05:00:00 on 2026-06-29.
The best air quality in Keene, New Hampshire was recorded at 03:00:00 on 2026-06-29.
The real-time air quality index in Keene, New Hampshire is 56, currently categorized as Moderate.
The most common pollutant in Keene, New Hampshire is PM2.5.
If the air quality in Keene, New Hampshire is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Keene, New Hampshire at present are 11.601 μg/m3.
The current PM10 levels in Keene, New Hampshire are 50.989 μg/m3.
The current carbon monoxide (CO) level in Keene, New Hampshire is 0.112 ppm.
The current sulfur dioxide (SO2) levels in Keene, New Hampshire are 0.375 ppb.
The current ozone (O3) levels at Keene, New Hampshire is 27.003 ppm.
The current nitrogen dioxide (NO2) levels at Keene, New Hampshire is 1.879 ppb.
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