Stay updated with real-time air quality in Westport, 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)
67
Moderate
Westport, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
9.99 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
23.75 μg/m³
0
55
155
255
425
605+
59.51 ppb
0
55
71
86
201
201+
0.34 ppb
0
36
76
186
605
1005+
6.62 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Westport, Connecticut
Westport, Connecticut
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AQI 74
Moderate
9.29μg/m³
PM2.5
20.55μg/m³
PM10
62.42ppb
O3
0.47ppb
SO2
3.46ppb
NO2
0.28ppm
CO
AQI 64
Moderate
9.16μg/m³
PM2.5
20.57μg/m³
PM10
59.41ppb
O3
0.45ppb
SO2
3.74ppb
NO2
0.28ppm
CO
AQI 52
Moderate
9.54μg/m³
PM2.5
19.87μg/m³
PM10
54.81ppb
O3
0.30ppb
SO2
4.23ppb
NO2
0.28ppm
CO
AQI 52
Moderate
9.83μg/m³
PM2.5
53.08μg/m³
PM10
45.39ppb
O3
0.53ppb
SO2
4.37ppb
NO2
0.28ppm
CO
AQI 49
Good
8.84μg/m³
PM2.5
38.80μg/m³
PM10
47.81ppb
O3
0.60ppb
SO2
4.44ppb
NO2
0.28ppm
CO
AQI 64
Moderate
10.03μg/m³
PM2.5
24.58μg/m³
PM10
58.92ppb
O3
0.59ppb
SO2
4.40ppb
NO2
0.28ppm
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 Westport, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Westport, Connecticut was at its worst at 09:00:00 on 2026-08-07.
In the last 24 hours, the best air quality in Westport, Connecticut was observed at 12:00:00 on 2026-08-08.
As of now, the AQI in Westport, Connecticut is 90, indicating Moderate conditions.
Westport, Connecticut air has the highest levels of O3.
Poor air quality in Westport, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Westport, Connecticut are currently 8.452 μg/m3.
The PM10 concentration in Westport, Connecticut is 35.156 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westport, Connecticut is 0.278 ppm.
Currently, Westport, Connecticut has a sulfur dioxide (SO2) concentration of 0.524 ppb.
The current ozone (O3) level in Westport, Connecticut at the moment is 67.013 ppm.
Nitrogen dioxide (NO2) level in Westport, Connecticut at the moment is 6.064 ppb.
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