Environmental Protection Agency (EPA) air pollution resources The Environmental Protection Agency provides a variety of references and studies on air pollution. Mar 01, 2005 If you are not automatically redirected, follow this link: http://www.epa.gov/oar/oarpubs.html Free Subscriptions E-Newsletters Digital Editions Chemical Processing Digital Edition Access the entire print issue on-line and be notified each month via e-mail when your new issue is ready for you. Subscribe Today. chemicalprocessing.com E-Newsletters Stay ahead of the curve with free e-newsletters and alerts. They are delivered to your inbox on a regular basis and you may unsubscribe at any time. Subscribe Today.