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)
27
Good
Lexington, Massachusetts
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.00 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
6.68 μg/m³
0
55
155
255
425
605+
29.20 ppb
0
55
71
86
201
201+
0.41 ppb
0
36
76
186
605
1005+
7.68 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Lexington, Massachusetts
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AQI 27
Good
3.28μg/m³
PM2.5
12.04μg/m³
PM10
28.84ppb
O3
0.39ppb
SO2
10.12ppb
NO2
0.23ppm
CO
AQI 22
Good
3.25μg/m³
PM2.5
14.48μg/m³
PM10
24.20ppb
O3
0.38ppb
SO2
9.78ppb
NO2
0.25ppm
CO
AQI 27
Good
1.86μg/m³
PM2.5
5.75μg/m³
PM10
28.73ppb
O3
0.50ppb
SO2
9.04ppb
NO2
0.23ppm
CO
AQI 22
Good
3.28μg/m³
PM2.5
14.64μg/m³
PM10
24.11ppb
O3
0.38ppb
SO2
9.86ppb
NO2
0.25ppm
CO
AQI 27
Good
2.31μg/m³
PM2.5
5.50μg/m³
PM10
28.72ppb
O3
0.43ppb
SO2
9.63ppb
NO2
0.23ppm
CO
AQI 27
Good
2.31μg/m³
PM2.5
5.50μg/m³
PM10
28.72ppb
O3
0.43ppb
SO2
9.63ppb
NO2
0.23ppm
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 2026-02-11.
In the last 24 hours, the best air quality in Lexington, Massachusetts was observed at 12:00:00 on 2026-02-12.
As of now, the AQI in Lexington, Massachusetts is 27, indicating Good conditions.
Lexington, Massachusetts air has the highest levels of O3.
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 3.001 μg/m3.
The PM10 concentration in Lexington, Massachusetts is 6.685 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Lexington, Massachusetts is 0.233 ppm.
Currently, Lexington, Massachusetts has a sulfur dioxide (SO2) concentration of 0.414 ppb.
The current ozone (O3) level in Lexington, Massachusetts at the moment is 29.196 ppm.
Nitrogen dioxide (NO2) level in Lexington, Massachusetts at the moment is 7.679 ppb.
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