Environment

Air Quality

Breathing polluted air can pose serious health risks. As late as the 1980s, air pollution regularly blanketed the metropolitan Washington region on hot and humid summer days. The region has made tremendous progress in its air quality thanks to more than a decade of actions at the federal, state, and local government levels; however, there is still more work to be done to reduce pollution further.   

COG, through the Metropolitan Washington Air Quality Committee (MWAQC), coordinates regional air quality planning activities, reviews policies, resolves policy differences, and adopts air quality plans for transmittal to the District of Columbia, Maryland, and Virginia. MWAQC members include area elected officials, environmental directors, and state air management and transportation officials. COG has also been providing regional air quality forecasts since the 1970s, and its Clean Air Partners program educates people on ways to reduce air pollution and protect their health. 

Featured Content

Air Quality Progress Dashboard

Data showing region's progress in improving air quality. 

What We Can Do to Improve Air Quality in the Metropolitan Washington Region 

Report presenting a menu of options to help achieve no unhealthy air days in the region compiled by COG staff for the Metropolitan Washington Air Quality Committee and the Air and Climate Public Advisory Committee.

Environmental Justice Subcommittee

The Environmental Justice (EJ) Subcommittee of the Metropolitan Washington Air Quality Committee is currently developing a regional air quality action plan. To inform the plan development, MWAQC has partnered with Equitable Cities to coordinate public outreach.

News & Multimedia

  • Air_Quality_25
    News

    2025 ozone data shows continued progress in regional air quality

    October 22, 2025

    The metropolitan Washington region experienced five “Code Orange” unhealthy air days in 2025, a decrease from seven days in 2024, according to data collected as...

  • Omniride_I66_Express_mobility_partners_640
    News

    TPB sets schedule for final steps of Visualize 2050 plan review and approval

    July 28, 2025

    The National Capital Region Transportation Planning Board (TPB) has announced the final schedule for development, review, and approval of the Visualize 2050...

  • Untitled_design
    News

    Code Orange unhealthy air forecast tomorrow, June 12, in the DC region

    June 11, 2025

    The Metropolitan Washington Council of Governments (COG) has forecast a Code Orange air day for part of/all of the metropolitan Washington region tomorrow: June...

  • (Web)_Think_Regionally
    News

    Podcast: Improving community health through air quality initiatives

    April 9, 2024

    In this episode of Think Regionally, host Robert McCartney speaks with Kristen Willard of the Global Allergy & Airways Patient Platform, DC Department of Energy...

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