Stay updated with real-time air quality in Westminster, Maryland 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)
54
Moderate
Westminster, Maryland
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
11.40 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
40.56 μg/m³
0
55
155
255
425
605+
29.21 ppb
0
55
71
86
201
201+
0.36 ppb
0
36
76
186
605
1005+
21.01 ppb
0
54
101
361
1250
2050+
0.34 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Westminster, Maryland
Scroll To Air Quality MapLoading...
AQI 54
Moderate
10.77μg/m³
PM2.5
40.91μg/m³
PM10
42.58ppb
O3
0.37ppb
SO2
20.94ppb
NO2
0.35ppm
CO
AQI 56
Moderate
11.99μg/m³
PM2.5
53.48μg/m³
PM10
48.00ppb
O3
0.37ppb
SO2
19.26ppb
NO2
0.34ppm
CO
AQI 52
Moderate
9.62μg/m³
PM2.5
41.76μg/m³
PM10
32.63ppb
O3
0.38ppb
SO2
23.35ppb
NO2
0.34ppm
CO
AQI 49
Good
8.69μg/m³
PM2.5
37.92μg/m³
PM10
28.75ppb
O3
0.37ppb
SO2
21.47ppb
NO2
0.35ppm
CO
AQI 58
Moderate
13.18μg/m³
PM2.5
47.72μg/m³
PM10
40.34ppb
O3
0.37ppb
SO2
36.31ppb
NO2
0.34ppm
CO
AQI 58
Moderate
13.33μg/m³
PM2.5
45.67μg/m³
PM10
39.49ppb
O3
0.36ppb
SO2
40.48ppb
NO2
0.34ppm
CO
Air quality and pollutant data for Maryland, 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 Westminster, Maryland is updated every hour for accuracy.
In the past 24 hours, the air quality in Westminster, Maryland was at its worst at 09:00:00 on 2026-04-23.
In the last 24 hours, the best air quality in Westminster, Maryland was observed at 03:00:00 on 2026-04-24.
As of now, the AQI in Westminster, Maryland is 49, indicating Good conditions.
Westminster, Maryland air has the highest levels of PM2.5.
Poor air quality in Westminster, Maryland means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Westminster, Maryland are currently 9.437 μg/m3.
The PM10 concentration in Westminster, Maryland is 30.144 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westminster, Maryland is 0.348 ppm.
Currently, Westminster, Maryland has a sulfur dioxide (SO2) concentration of 0.382 ppb.
The current ozone (O3) level in Westminster, Maryland at the moment is 30.031 ppm.
Nitrogen dioxide (NO2) level in Westminster, Maryland at the moment is 19.03 ppb.
All Rights Reserved © Ambee Inc. 2025