Stay updated with real-time air quality in Stonington, Connecticut 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)
24
Good
Stonington, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.58 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
7.35 μg/m³
0
55
155
255
425
605+
25.53 ppb
0
55
71
86
201
201+
0.23 ppb
0
36
76
186
605
1005+
4.09 ppb
0
54
101
361
1250
2050+
0.19 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Stonington, Connecticut
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AQI 22
Good
2.70μg/m³
PM2.5
9.21μg/m³
PM10
24.40ppb
O3
0.24ppb
SO2
4.51ppb
NO2
0.20ppm
CO
AQI 22
Good
2.70μg/m³
PM2.5
5.01μg/m³
PM10
24.00ppb
O3
0.27ppb
SO2
4.32ppb
NO2
0.18ppm
CO
AQI 23
Good
2.56μg/m³
PM2.5
5.68μg/m³
PM10
25.10ppb
O3
0.27ppb
SO2
4.48ppb
NO2
0.19ppm
CO
AQI 22
Good
2.70μg/m³
PM2.5
5.01μg/m³
PM10
24.00ppb
O3
0.27ppb
SO2
4.32ppb
NO2
0.18ppm
CO
AQI 22
Good
2.68μg/m³
PM2.5
5.09μg/m³
PM10
24.13ppb
O3
0.27ppb
SO2
4.29ppb
NO2
0.18ppm
CO
AQI 22
Good
2.62μg/m³
PM2.5
5.26μg/m³
PM10
24.49ppb
O3
0.27ppb
SO2
4.24ppb
NO2
0.18ppm
CO
Air quality and pollutant data for Connecticut, 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 Stonington, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Stonington, Connecticut was at its worst at 03:00:00 on 2026-02-11.
In the last 24 hours, the best air quality in Stonington, Connecticut was observed at 02:00:00 on 2026-02-12.
As of now, the AQI in Stonington, Connecticut is 24, indicating Good conditions.
Stonington, Connecticut air has the highest levels of O3.
Poor air quality in Stonington, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Stonington, Connecticut are currently 2.576 μg/m3.
The PM10 concentration in Stonington, Connecticut is 7.352 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Stonington, Connecticut is 0.189 ppm.
Currently, Stonington, Connecticut has a sulfur dioxide (SO2) concentration of 0.232 ppb.
The current ozone (O3) level in Stonington, Connecticut at the moment is 25.533 ppm.
Nitrogen dioxide (NO2) level in Stonington, Connecticut at the moment is 4.086 ppb.
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