Real-time air quality index in Halfway, Maryland today
Stay updated with real-time air quality in Halfway, 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)
41
Good
Halfway, Maryland
Last updated: ... (Local time)
Common air pollutants in Halfway, Maryland
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
4.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
17.89 μg/m³
0
55
155
255
425
605+
Ozone (O3)
44.10 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.69 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
7.46 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Halfway, Maryland
Halfway, Maryland
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Halfway, Maryland air quality map: Real-time AQI near you
Air quality in nearby cities
Hagerstown, Maryland
AQI 42
Good
4.53μg/m³
PM2.5
18.26μg/m³
PM10
44.57ppb
O3
0.69ppb
SO2
7.52ppb
NO2
0.24ppm
CO
Waynesboro, Pennsylvania
AQI 54
Moderate
8.95μg/m³
PM2.5
43.69μg/m³
PM10
55.83ppb
O3
0.70ppb
SO2
8.45ppb
NO2
0.24ppm
CO
Martinsburg, West Virginia
AQI 58
Moderate
12.89μg/m³
PM2.5
39.40μg/m³
PM10
44.98ppb
O3
0.69ppb
SO2
4.03ppb
NO2
0.24ppm
CO
Guilford, Pennsylvania
AQI 64
Moderate
8.20μg/m³
PM2.5
34.52μg/m³
PM10
58.70ppb
O3
0.69ppb
SO2
8.46ppb
NO2
0.24ppm
CO
Chambersburg, Pennsylvania
AQI 64
Moderate
9.16μg/m³
PM2.5
28.23μg/m³
PM10
58.80ppb
O3
0.69ppb
SO2
8.44ppb
NO2
0.24ppm
CO
Frederick, Maryland
AQI 49
Good
9.06μg/m³
PM2.5
27.43μg/m³
PM10
30.66ppb
O3
0.64ppb
SO2
5.82ppb
NO2
0.24ppm
CO
How accurate is Maryland, USA air quality data?
Air quality measurements for Maryland, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Frequently asked questions
How frequently is the air quality data for Halfway, Maryland updated?
Air quality data for Halfway, Maryland is updated on an hourly basis.
When did Halfway, Maryland experience the worst air quality in the last 24 hours?
The worst air quality in Halfway, Maryland was recorded at 07:00:00 on 2026-04-23.
When did Halfway, Maryland have its best air quality in the last 24 hours?
The best air quality in Halfway, Maryland was recorded at 02:00:00 on 2026-04-23.
What is the real-time air quality index for Halfway, Maryland?
The real-time air quality index in Halfway, Maryland is 41, currently categorized as Good.
Which pollutant is found most often in Halfway, Maryland?
The most common pollutant in Halfway, Maryland is O3.
What can I do if the air quality in Halfway, Maryland is poor?
If the air quality in Halfway, Maryland is poor, limit outdoor activities and use a mask to safeguard your health.
What are the current PM2.5 levels in Halfway, Maryland?
The measured PM2.5 levels in Halfway, Maryland at present are 4.39 μg/m3.
What are the current PM10 levels at Halfway, Maryland?
The current PM10 levels in Halfway, Maryland are 17.893 μg/m3.
What are the current carbon monoxide (CO) levels at Halfway, Maryland?
The current carbon monoxide (CO) level in Halfway, Maryland is 0.242 ppm.
What are the current sulfur dioxide (SO2) levels at Halfway, Maryland?
The current sulfur dioxide (SO2) levels in Halfway, Maryland are 0.695 ppb.
What are the current ozone (O3) levels at Halfway, Maryland?
The current ozone (O3) levels at Halfway, Maryland is 44.098 ppm.
What are the current nitrogen dioxide (NO2) levels at Halfway, Maryland?
The current nitrogen dioxide (NO2) levels at Halfway, Maryland is 7.455 ppb.
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