Center for Clean Air Policy (CCAP)
http://www.ccap.org/

Citizens League for Environmental Action Now (CLEAN)
http://www.cleanhouston.org/

Clean Air Initiative
http://www.cleanairinitiative.org/portal/index.php

Clean Air Revival, Inc.
http://burningissues.org/car-www/

Clean Air Task Force
http://www.catf.us/

Clean Air Trust
http://www.cleanairtrust.org/

Coalition for Clean Air (CCA)
http://www.coalitionforcleanair.org

Partners for Clean Air
http://www.cleantheair.org/

Project Clean Air
http://www.projectcleanair.org/