Air quality in Washington

Air quality index (AQI) and PM2.5 air pollution in Washington

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The profile logo of Clean Air PartnersThe profile logo of Metropolitan Washington Council of Governments (MWCOG) The profile logo of Environmental Protection AgencyThe profile logo of 2 Anonymous contributorThe profile logo of Clean Air PartnersThe profile logo of Metropolitan Washington Council of Governments (MWCOG)

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What is the current weather in Washington?

Weather icon
WeatherFew clouds
Wind8.1 mp/h
Pressure1019 mb

live aqi city ranking

Real-time USA city ranking

#cityUS AQI
1 Bristow, Indiana


2 Portola, California


3 Seeley Lake, Montana


4 Klamath Falls, Oregon


5 Hot Sulphur Springs, Colorado


6 Peaceful Valley, Washington


7 Willits, California


8 Tuolumne City, California


9 Kingston, Washington


10 Laytonville, California


(local time)


live Washington aqi ranking

Real-time Washington air quality ranking

#stationUS AQI
1 DCNearRoad


2 River Terrace


3 The Towers


4 E Street Southeast


5 McMillan Reservoir


6 Takoma Rec


(local time)


Washington webcam

8:01, Mar 3

Is there air pollution in Washington?

Thumbnail of Washington webcam at 8:01, Mar 3



live AQI index

Human face indicating AQI level


What is the current air quality in Washington?

Air pollution levelAir quality indexMain pollutant
Good 27 US AQItrendPM2.5
6.6 µg/m³trend
27.2 µg/m³

Health Recommendations

How to protect from air pollution in Washington?

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Washington air quality index (AQI) forecast

DayPollution levelWeatherTemperatureWind
Saturday, Feb 27

Good 43 US AQI

Human face indicating AQI level
Sunday, Feb 28

Good 32 US AQI

Human face indicating AQI level
Monday, Mar 1

Good 14 US AQI

Human face indicating AQI level
Tuesday, Mar 2

Good 23 US AQI

Human face indicating AQI level
Weather icon55.4°32°
Wind rotating 273 degree

4.5 mp/h


Moderate 57 US AQI

Human face indicating AQI level
Weather icon46.4°32°
Wind rotating 316 degree

13.4 mp/h

Thursday, Mar 4

Moderate 65 US AQI

Human face indicating AQI level
Weather icon41°28.4°
Wind rotating 308 degree

13.4 mp/h

Friday, Mar 5

Good 33 US AQI

Human face indicating AQI level
Weather icon42.8°32°
Wind rotating 303 degree

8.9 mp/h

Saturday, Mar 6

Moderate 69 US AQI

Human face indicating AQI level
Weather icon42.8°30.2°
Wind rotating 309 degree

8.9 mp/h

Sunday, Mar 7

Moderate 78 US AQI

Human face indicating AQI level
Weather icon50°30.2°
Wind rotating 291 degree

4.5 mp/h

Monday, Mar 8

Moderate 62 US AQI

Human face indicating AQI level
Weather icon62.6°35.6°
Wind rotating 213 degree

4.5 mp/h

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Historic air quality graph for Washington

How to best protect from air pollution?

Reduce your air pollution exposure in Washington


What is the air quality in Washington DC?

Washington DC’s air quality suffers from high ozone levels, which exceed government standards. The city, however, meets federal attainment for all other key criteria pollutants monitored by the US Environmental Protection Agency (EPA): PM2.5, PM10, CO, SO2, and NO2.

Ozone is an invisible, highly reactive gas molecule composed of three oxygen atoms. Rather than being directly emitted into our air by industrial activity, motor engines, or various sources of combustion, like other criteria pollutants, ozone is formed in our atmosphere from airborne hydrocarbons and nitrogen oxides reacting in sunlight. This property of forming from precursor pollutants in the air rather than ground-based activity makes ozone difficult to manage. Precursor pollutants may originate from local emission sources or flow into a city from up to a thousand miles away.

Breathing ozone pollution can cause serious health complications, ranging from a cough and breathing problems to respiratory infections, cardiovascular effects, and premature death.

The District of Columbia has failed to meet ozone attainment levels since at least 1996.1 Several years ago, the city got close, however, with a weighted average of 3.3 unhealthy ozone days from 2014-2016, just slightly above the 3.2-daylimit for unhealthy days. Since this period, Washington DC’s ozone levels have been on the rise. From 2016 to 2018, the most recent monitoring period, the city experienced 5.2 unhealthy ozone days. These days in excess of safe ozone levels have landed the city an “F” rating for ozone levels since tracking began.

A study conducted by the Ozone Transport Commission estimated that roughly 24,448 residents experienced acute respiratory symptoms in 2018 as a result of high ozone levels, while 19 were admitted to the hospital for severe symptoms.2 Warming temperatures as a result of climate change are expected to increase ozone levels as a result of hotter, more ideal conditions for ozone formation. To combat this, increased regulation on heavy duty trucks and vehicles as well as improved regional cooperation with nearby Virginia and Maryland is critical to further reducing ozone levels in the future in the wake of rising temperatures.

Fine particulate matter, or PM2.5, is another closely monitored and actively managed pollutant in Washington DC. PM2.5 describes any airborne particulate matter smaller than 2.5 microns in size, including a wide range of chemical makeups and sources. Its near microscopic size enables PM2.5 to be inhaled deep into the lungs and often into the bloodstream. This property contributes to PM2.5’s far reaching health implications, including short-term effects like coughing, wheezing, shortness of breath, and aggravated asthma as well as long-term effects like lung damage and decreased lung function, cancer, and premature mortality.3

Though Washington DC has met federal attainment levels for annual and 24-hour PM2.5 since 2009, pollution events are not uncommon, particularly during the winter months. December, January, and February are often Washington DC’s most polluted months for PM2.5. During these months, increased emissions from home and building heating can become trapped by temperature inversions, a weather event in which a hot layer of air traps cooler, more polluted ground-level air from rising and dispersing. In 2017, October, November and December all experienced average PM2.5 levels in the “moderate” US AQI category, outside of the federal target.

Follow live air quality data in Washington DC at the top of this page and on the IQAir air pollution app. Use the District of Colombia forecast air quality data to plan ahead and take precautionary measures to reduce your pollution exposure.

How is the air quality in Washington DC?

From a long-term perspective, air quality in Washington DC has seen drastic improvements over recent decades. Data from the EPA National Emissions Inventory (NEI) estimates that emissions of all criteria pollutants and their precursors have gradually fallen since 1996. These reductions come despite increases in population, employment, and households, suggesting that actions taken to control Washington DC’s air pollution have generally been successful.

Air quality levels in Washington DC are notably lower than neighboring cities. This has been true for ozone levels since 2002 and PM2.5 levels since 2008.2 Air pollution levels in nearby Baltimore, for example, are consistently worse, on average, than Washington DC. Polluted air blown from Maryland and Virginia contribute significant amounts of pollution to the DC area. Cooperating with neighboring states to implement further legislation on emissions presents an opportunity for further reducing air pollution in the District.

Air quality levels in Washington DC fell by 10 to 20 percent during the 2020 COVID-19 lockdown compared to the same time period a year prior in 2019.4 City lockdown measures shuttered nonessential businesses and resulted in greatly reduced traffic congestion, as residents tended to avoid non-essential travel. These reductions highlight what could be achieved through transitioning residents to greener transport options and more fuel efficient, lower-emission vehicles.

In recent years, Washington DC has taken steps to improve the attractiveness and accessibility of green transport options like walking and biking, which reduce car traffic and lead to cleaner air in the district. This strategy has included adding many more miles of bike lanes, instituting “slow streets” that limit vehicle speeds to 15 mph, and growing the network of city sidewalks.

Does Washington DC have good air quality?

Washington unhealthy air quality is the result of elevated ozone levels. As an urban area with relatively little industry, the majority of Washington DC air pollution comes from vehicular emissions and emissions blowing in from neighboring cities and states.

Nearly half of Washington DC air pollution originates from mobile sources: cars, trucks, trains, and planes. On-the-road mobile emissions are the largest source of the ozone precursor nitrogen dioxide (NOx) and the second largest source of the ozone precursor volatile organic compounds (VOCs).2

Regionally, most precursor pollutants for ozone formation originate in the areas surrounding Washington DC. Maryland is estimated to contribute to 52% of the region’s VOCs and 47% of the regions NOx, while Virgiana contributes 43% of the VOCs and 45% of the NOx. Washington DC, on the other hand, is estimated to only contribute 5% of the region’s VOCs and 8% of the regions NOx.

Washington DC AQI can vary from location to location, even within the city. Use the Washington DC air pollution map to understand the flow of emissions from neighboring cities and local sources.

+ Article Resources
[1] American Lung Association. (2019). State of the air – 2019.
[2] Monitoring and Assessment Branch Air Quality Division Department of Energy and Environment. (2020). Ambient air quality trends report, 1996-2019.
[3] World Health Organization. (2020). Air quality guidelines – global update 2005.
[4] Goffman E. (2020, June 29). DC has cleaner air now. But as reopening plans continue, how can it keep the pollution at bay?

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