Since Barack Obama was sworn in as President in 2009, the Environmental Protection Agency (EPA) has proposed and promulgated numerous regulations implementing the pollution control statutes enacted by Congress. Critics have reacted strongly. Many, both within Congress and outside of it, have accused the agency of reaching beyond the authority given it by Congress and ignoring or underestimating the costs and economic impacts of proposed and promulgated rules. The House has conducted vigorous oversight of the agency in the 112th and 113th Congresses, and has approved several bills that would overturn specific regulations or limit the agency's authority. Particular attention has been paid to the Clean Air Act; congressional scrutiny has focused as well on other environmental statutes and regulations implemented by EPA.