Stay updated with real-time air quality in Killingly, 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)
18
Good
Killingly, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
9.89 μg/m³
0
55
155
255
425
605+
19.04 ppb
0
55
71
86
201
201+
0.48 ppb
0
36
76
186
605
1005+
2.22 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Killingly, Connecticut
Killingly, Connecticut
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AQI 20
Good
1.88μg/m³
PM2.5
10.12μg/m³
PM10
22.39ppb
O3
0.41ppb
SO2
5.75ppb
NO2
0.18ppm
CO
AQI 17
Good
2.77μg/m³
PM2.5
11.89μg/m³
PM10
17.70ppb
O3
0.50ppb
SO2
3.13ppb
NO2
0.20ppm
CO
AQI 20
Good
2.45μg/m³
PM2.5
10.09μg/m³
PM10
21.94ppb
O3
0.45ppb
SO2
5.77ppb
NO2
0.19ppm
CO
AQI 17
Good
2.63μg/m³
PM2.5
9.97μg/m³
PM10
18.49ppb
O3
0.41ppb
SO2
2.98ppb
NO2
0.17ppm
CO
AQI 19
Good
3.15μg/m³
PM2.5
9.66μg/m³
PM10
20.96ppb
O3
0.31ppb
SO2
2.24ppb
NO2
0.22ppm
CO
AQI 19
Good
3.31μg/m³
PM2.5
8.72μg/m³
PM10
21.08ppb
O3
0.37ppb
SO2
1.90ppb
NO2
0.22ppm
CO
Air quality measurements for Connecticut, 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 Killingly, Connecticut is updated on an hourly basis.
The worst air quality in Killingly, Connecticut was recorded at 08:00:00 on 2026-11-12.
The best air quality in Killingly, Connecticut was recorded at 10:00:00 on 2026-11-12.
The real-time air quality index in Killingly, Connecticut is 18, currently categorized as Good.
The most common pollutant in Killingly, Connecticut is O3.
If the air quality in Killingly, Connecticut is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Killingly, Connecticut at present are 3.039 μg/m3.
The current PM10 levels in Killingly, Connecticut are 9.888 μg/m3.
The current carbon monoxide (CO) level in Killingly, Connecticut is 0.204 ppm.
The current sulfur dioxide (SO2) levels in Killingly, Connecticut are 0.479 ppb.
The current ozone (O3) levels at Killingly, Connecticut is 19.036 ppm.
The current nitrogen dioxide (NO2) levels at Killingly, Connecticut is 2.222 ppb.
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