Worst air pollution Washington Monument - Washington, today and tomorrow
Today (20 September): Air quality in Washington Monument is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 25.4/100).
Tomorrow (21 September 2026): Air quality in Washington Monument is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 27.1/100). 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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Washington DC's Washington Monument air quality benefits from the National Mall's central open position, with the monument's elevated grassy plaza providing among the Mall's best natural dispersal geometry. Vehicle traffic on 15th Street contributes modest local sources, while the surrounding open lawn and the Potomac River's limited ventilation generally maintain moderate Washington DC metropolitan readings and the Mall's open character provides better conditions than the enclosed street canyons throughout most of the year.
Today - 20 September | Pollution peaks at 12:00
AQI:
Fair
25.4/100
PM2.5 (fine particles):
Fair
24.4/100
PM10 (coarse particles):
Good
14.7/100
NO2 (nitrogen dioxide):
Good
17.9/100
O3 (ozone):
Fair
25.4/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.2/100
PM1 (ultrafine particles):
Good
15.1/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 13:00
AQI:
Fair
27.1/100
PM2.5 (fine particles):
Fair
24.3/100
PM10 (coarse particles):
Good
14.4/100
NO2 (nitrogen dioxide):
Fair
25.1/100
O3 (ozone):
Fair
27.1/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.5/100
PM1 (ultrafine particles):
Good
16.7/100
Other Landmarks in Washington
Sports venues in Washington
Frequently Asked Questions
Is air quality bad in Washington Monument right now?
On 20 September 2026, overall air quality in Washington Monument is fair. AQI is the main air quality indicator at 25.4/100. Pollution peaks around 12:00 PM (O3: 25.4/100).
Will air quality be worse tomorrow in Washington Monument?
On 21 September 2026, air quality conditions in Washington Monument will be similar to today, with AQI forecast at fair at 27.1/100. Pollution peaks around 1:00 PM (O3: 27.1/100).
When is air pollution at its worst in Washington Monument?
Air quality around Washington Monument changes with the seasons — once summer ozone season ends, winter typically offers the cleanest air, whereas the hottest, most humid summer weeks bring the year's highest ozone readings. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Washington Monument 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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