In this Jan. 9, 2013, photo, an inversion cloud covers downtown Salt Lake City. A powerful state board is moving to require emissions controls on smoky char broilers at hamburger joints. Other measures set to take effect in northern Utah this year will force changes in everyday products, from oven cleaners to aerosol deodorants and hair spray. It's all part of a comprehensive plan to curb smog that hangs over the greater Salt Lake region. (AP Photo/The Deseret News, Ravell Cal)
