Sierra Club, American Lung Association, Environment Texas, Mothers for Clean Air and other health and environmental groups in the Clean Air Texas coalition rallied their members and allies to attend the U.S. Environmental Protection Agency's hearing at the Houston Hobby Hilton on Tuesday, February 2nd. The Clean Air Texas coalition held a press conference in support of clean air, healthy Texans, and a vital new air quality standard limiting ozone pollution to 60 parts per billion.