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)
44
Good
Westport, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.56 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.25 μg/m³
0
55
155
255
425
605+
46.97 ppb
0
55
71
86
201
201+
0.41 ppb
0
36
76
186
605
1005+
1.67 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Westport, Connecticut
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AQI 44
Good
5.66μg/m³
PM2.5
18.07μg/m³
PM10
46.71ppb
O3
0.40ppb
SO2
2.40ppb
NO2
0.23ppm
CO
AQI 44
Good
5.76μg/m³
PM2.5
16.89μg/m³
PM10
46.62ppb
O3
0.40ppb
SO2
2.95ppb
NO2
0.22ppm
CO
AQI 44
Good
5.54μg/m³
PM2.5
15.74μg/m³
PM10
47.26ppb
O3
0.45ppb
SO2
4.13ppb
NO2
0.21ppm
CO
AQI 40
Good
5.10μg/m³
PM2.5
20.88μg/m³
PM10
42.97ppb
O3
0.35ppb
SO2
5.75ppb
NO2
0.23ppm
CO
AQI 42
Good
5.18μg/m³
PM2.5
16.49μg/m³
PM10
44.63ppb
O3
0.35ppb
SO2
6.78ppb
NO2
0.24ppm
CO
AQI 39
Good
5.14μg/m³
PM2.5
17.85μg/m³
PM10
42.38ppb
O3
0.38ppb
SO2
5.64ppb
NO2
0.24ppm
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 10:00:00 on 2026-03-29.
In the last 24 hours, the best air quality in Westport, Connecticut was observed at 06:00:00 on 2026-03-29.
As of now, the AQI in Westport, Connecticut is 44, indicating Good 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 5.563 μg/m3.
The PM10 concentration in Westport, Connecticut is 17.252 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westport, Connecticut is 0.224 ppm.
Currently, Westport, Connecticut has a sulfur dioxide (SO2) concentration of 0.405 ppb.
The current ozone (O3) level in Westport, Connecticut at the moment is 46.968 ppm.
Nitrogen dioxide (NO2) level in Westport, Connecticut at the moment is 1.665 ppb.
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