Stay updated with real-time air quality in Lexington, Massachusetts 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
Lexington, Massachusetts
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
7.92 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
19.45 μg/m³
0
55
155
255
425
605+
8.84 ppb
0
55
71
86
201
201+
0.47 ppb
0
36
76
186
605
1005+
20.81 ppb
0
54
101
361
1250
2050+
0.45 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Lexington, Massachusetts
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AQI 44
Good
8.40μg/m³
PM2.5
25.44μg/m³
PM10
8.52ppb
O3
0.47ppb
SO2
24.50ppb
NO2
0.43ppm
CO
AQI 38
Good
6.69μg/m³
PM2.5
25.78μg/m³
PM10
7.25ppb
O3
0.38ppb
SO2
27.80ppb
NO2
0.49ppm
CO
AQI 44
Good
8.02μg/m³
PM2.5
24.96μg/m³
PM10
7.19ppb
O3
0.46ppb
SO2
24.38ppb
NO2
0.44ppm
CO
AQI 38
Good
6.65μg/m³
PM2.5
25.30μg/m³
PM10
7.29ppb
O3
0.38ppb
SO2
27.79ppb
NO2
0.49ppm
CO
AQI 49
Good
8.58μg/m³
PM2.5
25.97μg/m³
PM10
5.92ppb
O3
0.47ppb
SO2
24.57ppb
NO2
0.45ppm
CO
AQI 49
Good
8.58μg/m³
PM2.5
25.97μg/m³
PM10
5.92ppb
O3
0.47ppb
SO2
24.57ppb
NO2
0.45ppm
CO
Air quality and pollutant data for Massachusetts, 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 Lexington, Massachusetts is updated every hour for accuracy.
In the past 24 hours, the air quality in Lexington, Massachusetts was at its worst at 03:00:00 on 2026-03-05.
In the last 24 hours, the best air quality in Lexington, Massachusetts was observed at 07:00:00 on 2026-03-04.
As of now, the AQI in Lexington, Massachusetts is 44, indicating Good conditions.
Lexington, Massachusetts air has the highest levels of PM2.5.
Poor air quality in Lexington, Massachusetts means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Lexington, Massachusetts are currently 7.925 μg/m3.
The PM10 concentration in Lexington, Massachusetts is 19.453 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Lexington, Massachusetts is 0.45 ppm.
Currently, Lexington, Massachusetts has a sulfur dioxide (SO2) concentration of 0.474 ppb.
The current ozone (O3) level in Lexington, Massachusetts at the moment is 8.84 ppm.
Nitrogen dioxide (NO2) level in Lexington, Massachusetts at the moment is 20.807 ppb.
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