This guide was updated in February 2017.
American Association of State Highway Transportation officials
http://www.transportation.org/
Metropolitan Planning Organizations (MPOs) or Councils of Government
Association of Metropolitan Transportation Planning Organizations
http://www.ampo.org/
National Association of Regional Councils
http://www.narc.org/
Public Transportation Agencies
American Public Transportation Association
http://www.apta.com/
State or Local Air Agencies
National Association of Clean Air Agencies
http://www.4cleanair.org
Federal Highway Administration
Air Quality and Transportation Conformity Team
http://www.fhwa.dot.gov/hep/contacts/hepoffice.cfm
Division Offices
http://www.fhwa.dot.gov/about/field.cfm#fieldsites
Resource Center
http://www.fhwa.dot.gov/resourcecenter/teams/airquality/index.cfm
Federal Transit Administration
Regional offices
http://www.fta.dot.gov/about_FTA_FTA_Offices.html
Environmental Protection Agency
EPA office of Transportation and Air Quality (OTAQ)
http://www.epa.gov/otaq/stateresources/transconf/index.htm
Regional offices
http://www.epa.gov/otaq/stateresources/transconf/contacts.htm
