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)
42
Good
Lexington, Massachusetts
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.32 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.18 μg/m³
0
55
155
255
425
605+
44.85 ppb
0
55
71
86
201
201+
0.52 ppb
0
36
76
186
605
1005+
3.92 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Lexington, Massachusetts
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AQI 43
Good
4.35μg/m³
PM2.5
15.46μg/m³
PM10
45.58ppb
O3
0.51ppb
SO2
4.10ppb
NO2
0.20ppm
CO
AQI 41
Good
4.18μg/m³
PM2.5
16.77μg/m³
PM10
43.69ppb
O3
0.61ppb
SO2
4.11ppb
NO2
0.20ppm
CO
AQI 43
Good
4.34μg/m³
PM2.5
19.52μg/m³
PM10
45.55ppb
O3
0.53ppb
SO2
4.13ppb
NO2
0.20ppm
CO
AQI 41
Good
4.18μg/m³
PM2.5
16.67μg/m³
PM10
43.67ppb
O3
0.61ppb
SO2
4.10ppb
NO2
0.20ppm
CO
AQI 42
Good
4.19μg/m³
PM2.5
19.36μg/m³
PM10
44.69ppb
O3
0.57ppb
SO2
4.12ppb
NO2
0.20ppm
CO
AQI 42
Good
4.19μg/m³
PM2.5
19.36μg/m³
PM10
44.69ppb
O3
0.57ppb
SO2
4.12ppb
NO2
0.20ppm
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 10:00:00 on 2026-03-29.
In the last 24 hours, the best air quality in Lexington, Massachusetts was observed at 03:00:00 on 2026-03-29.
As of now, the AQI in Lexington, Massachusetts is 42, 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 4.318 μg/m3.
The PM10 concentration in Lexington, Massachusetts is 15.176 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Lexington, Massachusetts is 0.2 ppm.
Currently, Lexington, Massachusetts has a sulfur dioxide (SO2) concentration of 0.518 ppb.
The current ozone (O3) level in Lexington, Massachusetts at the moment is 44.853 ppm.
Nitrogen dioxide (NO2) level in Lexington, Massachusetts at the moment is 3.918 ppb.
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