"Since Barack Obama was sworn in as President of the United States in 2009, the Environmental Protection Agency (EPA) has proposed and promulgated numerous regulations under the 11 pollution control statutes Congress has directed it to implement. Most of these statutes have not been amended for more than a decade, yet the agency is still addressing for the first time numerous directives given it by Congress, while also addressing newly emerging pollution problems and issues. The statutes also mandate that EPA conduct periodic reviews of many of the standards it issues, and the agency is doing these reviews, as well. […] EPA's actions, both individually and in sum, have generated controversy. […] This report provides a factual basis for discussion of these issues, which must ultimately be evaluated on a case-by-case basis. The report identifies and briefly characterizes major regulatory actions promulgated, proposed, or under development by EPA since January 2009. The report uses data from EPA's Semiannual Regulatory Agendas and the list of economically significant reviews conducted by the Office of Management and Budget (OMB) to compile a list of 45 regulatory actions proposed, promulgated, or under development by the agency."
CRS Report for Congress, R41561