Stay updated with real-time air quality in Portsmouth, 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
Portsmouth, New Hampshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
11.99 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
25.79 μg/m³
0
55
155
255
425
605+
16.21 ppb
0
55
71
86
201
201+
0.61 ppb
0
36
76
186
605
1005+
7.21 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Portsmouth, New Hampshire
Portsmouth, New Hampshire
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AQI 64
Moderate
15.59μg/m³
PM2.5
25.30μg/m³
PM10
19.02ppb
O3
1.71ppb
SO2
6.73ppb
NO2
0.37ppm
CO
AQI 62
Moderate
15.46μg/m³
PM2.5
30.90μg/m³
PM10
19.48ppb
O3
1.74ppb
SO2
7.08ppb
NO2
0.37ppm
CO
AQI 62
Moderate
15.34μg/m³
PM2.5
36.12μg/m³
PM10
20.69ppb
O3
1.96ppb
SO2
5.94ppb
NO2
0.37ppm
CO
AQI 62
Moderate
15.46μg/m³
PM2.5
35.54μg/m³
PM10
20.28ppb
O3
1.81ppb
SO2
7.43ppb
NO2
0.38ppm
CO
AQI 60
Moderate
13.73μg/m³
PM2.5
58.95μg/m³
PM10
18.34ppb
O3
1.98ppb
SO2
6.77ppb
NO2
0.36ppm
CO
AQI 62
Moderate
15.42μg/m³
PM2.5
35.76μg/m³
PM10
19.06ppb
O3
1.93ppb
SO2
6.51ppb
NO2
0.37ppm
CO
Air quality and pollutant data for New Hampshire, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Portsmouth, New Hampshire is updated every hour for accuracy.
In the past 24 hours, the air quality in Portsmouth, New Hampshire was at its worst at 09:00:00 on 2025-07-27.
In the last 24 hours, the best air quality in Portsmouth, New Hampshire was observed at 04:00:00 on 2025-07-28.
As of now, the AQI in Portsmouth, New Hampshire is 60, indicating Moderate conditions.
Portsmouth, New Hampshire air has the highest levels of PM2.5.
Poor air quality in Portsmouth, New Hampshire means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Portsmouth, New Hampshire are currently 14.183 μg/m3.
The PM10 concentration in Portsmouth, New Hampshire is 26.283 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Portsmouth, New Hampshire is 0.346 ppm.
Currently, Portsmouth, New Hampshire has a sulfur dioxide (SO2) concentration of 0.909 ppb.
The current ozone (O3) level in Portsmouth, New Hampshire at the moment is 26.521 ppm.
Nitrogen dioxide (NO2) level in Portsmouth, New Hampshire at the moment is 6.034 ppb.
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