Worst air pollution Gaithersburg, today and tomorrow
Today (16 July): Air quality in Gaithersburg is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 35.2/100).
Tomorrow (17 July 2026): Air quality in Gaithersburg is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 39.5/100). 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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Gaithersburg's air quality reflects the Montgomery County Maryland suburban corridor northwest of Washington DC, with vehicle emissions from I-270 and the surrounding government research and biotechnology corridor — including NIST and NIH campuses — contributing local sources. The broader Washington metropolitan airshed contributes regional ozone, while the flat suburban terrain and the Seneca Creek corridor provide reasonable dispersal throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Fair
35.2/100
PM2.5 (fine particles):
Good
12.8/100
PM10 (coarse particles):
Good
8.5/100
NO2 (nitrogen dioxide):
Good
9.2/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
8.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
39.5/100
PM2.5 (fine particles):
Good
15.8/100
PM10 (coarse particles):
Good
10.0/100
NO2 (nitrogen dioxide):
Good
8.9/100
O3 (ozone):
Fair
39.5/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
10.2/100
Pollen forecast in Gaithersburg
View pollen forecastFrequently Asked Questions
Is air quality bad in Gaithersburg right now?
On 16 July 2026, overall air quality in Gaithersburg is fair. AQI is the main air quality indicator at 35.2/100. Pollution peaks around 1:00 PM (O3: 35.2/100).
Will air quality be worse tomorrow in Gaithersburg?
On 17 July 2026, air quality conditions in Gaithersburg will be similar to today, with AQI forecast at fair at 39.5/100. Pollution peaks around 12:00 PM (O3: 39.5/100).
When is air pollution at its worst in Gaithersburg?
Air quality in Gaithersburg shifts across the year — once summer ozone season ends, winter typically offers the cleanest air, whereas summer heat waves bring the highest ozone risk, compounded by pollution drifting in from the wider region. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Gaithersburg 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