The Manufacturers of Emission Controls Association (MECA) is a non-profit association incorporated in Washington, D.C. It was formed in 1976 to provide technical information on emission control technology for motor vehicles. As the emission control industry grew in the subsequent decades, and as its member companies expanded control technology products to other sources, MECA’s mission expanded as well. Today, MECA’s members include leading manufacturers of a variety of emission control equipment and efficiency technologies for: 1) automobiles, trucks, and buses; 2) off-road vehicles; and 3) stationary sources.

You can find more information about MECA at their website.