Worst air pollution Frederick, today and tomorrow
Today (16 July): Air quality in Frederick is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 37.2/100).
Tomorrow (17 July 2026): Air quality in Frederick is fair. All pollutants stay as today. Pollution peaks around 1:00 PM (O3: 39.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Frederick's air quality reflects its position in the Monocacy Valley in western Maryland, with vehicle emissions from I-70 and US-15 and the surrounding biomedical and technology research corridor contributing local sources. The Catoctin Mountain to the west and South Mountain to the east create modest topographic enclosure, while the broader mid-Atlantic regional airshed contributes upwind industrial and urban sources from the Baltimore-Washington corridor under prevailing southeasterly summer wind patterns.
Today - 16 July | Pollution peaks at 14:00
AQI:
Fair
37.2/100
PM2.5 (fine particles):
Good
17.9/100
PM10 (coarse particles):
Good
13.7/100
NO2 (nitrogen dioxide):
Fair
26.7/100
O3 (ozone):
Fair
37.2/100
SO2 (sulfur dioxide):
Good
5.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
11.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Fair
39.1/100
PM2.5 (fine particles):
Good
19.9/100
PM10 (coarse particles):
Good
12.1/100
NO2 (nitrogen dioxide):
Fair
30.5/100
O3 (ozone):
Fair
39.1/100
SO2 (sulfur dioxide):
Good
4.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
13.1/100
Pollen forecast in Frederick
View pollen forecastFrequently Asked Questions
Is air quality bad in Frederick right now?
On 16 July 2026, overall air quality in Frederick is fair. AQI is the main air quality indicator at 37.2/100. Pollution peaks around 2:00 PM (O3: 37.2/100).
Will air quality be worse tomorrow in Frederick?
On 17 July 2026, air quality conditions in Frederick will be similar to today, with AQI forecast at fair at 39.1/100. Pollution peaks around 1:00 PM (O3: 39.1/100).
When is air pollution at its worst in Frederick?
Frederick sees air quality change through the year, as winter generally brings the cleanest air, once the summer ozone season has passed; by contrast, extended summer heat waves, often worsened by regional haze, bring the toughest air quality stretch. Suburban and rural areas generally see less of the persistent traffic-driven pollution that affects the urban core.
Are air quality levels in Frederick based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app