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)
34
Good
Westminster, Maryland
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.33 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
26.45 μg/m³
0
55
155
255
425
605+
37.15 ppb
0
55
71
86
201
201+
0.29 ppb
0
36
76
186
605
1005+
7.15 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Westminster, Maryland
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AQI 37
Good
5.97μg/m³
PM2.5
25.94μg/m³
PM10
39.95ppb
O3
0.23ppb
SO2
6.89ppb
NO2
0.25ppm
CO
AQI 36
Good
6.22μg/m³
PM2.5
27.19μg/m³
PM10
39.03ppb
O3
0.23ppb
SO2
11.85ppb
NO2
0.24ppm
CO
AQI 34
Good
4.79μg/m³
PM2.5
19.14μg/m³
PM10
36.56ppb
O3
0.30ppb
SO2
12.36ppb
NO2
0.25ppm
CO
AQI 37
Good
2.95μg/m³
PM2.5
15.22μg/m³
PM10
40.43ppb
O3
0.29ppb
SO2
5.22ppb
NO2
0.25ppm
CO
AQI 38
Good
2.11μg/m³
PM2.5
7.88μg/m³
PM10
41.18ppb
O3
0.24ppb
SO2
13.88ppb
NO2
0.24ppm
CO
AQI 40
Good
1.88μg/m³
PM2.5
6.67μg/m³
PM10
42.82ppb
O3
0.24ppb
SO2
14.57ppb
NO2
0.24ppm
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 07:00:00 on 2026-03-09.
In the last 24 hours, the best air quality in Westminster, Maryland was observed at 08:00:00 on 2026-03-09.
As of now, the AQI in Westminster, Maryland is 34, indicating Good conditions.
Westminster, Maryland air has the highest levels of O3.
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 6.325 μg/m3.
The PM10 concentration in Westminster, Maryland is 26.453 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westminster, Maryland is 0.244 ppm.
Currently, Westminster, Maryland has a sulfur dioxide (SO2) concentration of 0.288 ppb.
The current ozone (O3) level in Westminster, Maryland at the moment is 37.145 ppm.
Nitrogen dioxide (NO2) level in Westminster, Maryland at the moment is 7.152 ppb.
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