Contact Us about Nitrogen Dioxide (NO2) Pollution

Information is also available for the following topics:

• Air quality and air monitoring data nationally and locally
• Environmental protection activities in your region
• Air inside your home or other indoor locations 
• Air pollution from transportation

​On nitrogen dioxide air pollution:

• Status and trends in NO2
• Ambient air monitoring for NO2 near roads 

For comments or questions on the NO2 national ambient air quality standards more generally, please use the form below to send us comments or questions. Be sure to include your e-mail address if you’d like a response.

Mailing Address:

Environmental Protection Agency
Office of Air and Radiation (OAR) 6101A
1200 Pennsylvania Avenue, N.W.
Washington, DC 20460