The U.S. Environmental Protection Agency said it would tighten up pollution regulations for oil and gas facilities and equipment after being sued by environmental groups. The EPA agreed this week by way of a consent decree to take another look at its emissions rules relating to oil and gas storage, production, and transmission facilities. The Sierra Club, California Communities Against Toxic, and the Coalition for a Safe Environment filed a lawsuit last spring alleging that the EPA violated Section 304(a) of the Clean Air Act by failing to review…