Air quality has improved substantially in the United States in the 40 years of EPA's Clean Air Act regulation, but more needs to be done, according to the agency's science advisers, to protect public health and the environment from the effects of air pollution. Thus, the agency continues to promulgate regulations addressing air pollution using authority given it by Congress more than 20 years ago. In the 112th Congress, Members from both parties have raised questions about the cost effectiveness of some of these regulations and/or whether the agency has exceeded its regulatory authority in promulgating them. Others in Congress have supported EPA, noting that the Clean Air Act, often affirmed in court decisions, has authorized or required the agency's actions. EPA's regulatory actions on greenhouse gas (GHG) emissions have been one focus of congressional interest. Although the Obama Administration has consistently said that it would prefer that Congress pass new legislation to address climate change, such legislation now seems unlikely. Instead, over the last three years, EPA has developed GHG regulations using its existing Clean Air Act authority. EPA finalized GHG emission standards for cars and light trucks on April 1, 2010, and on August 28, 2012, and for larger trucks on August 9, 2011. The implementation of these standards, in turn, triggered permitting and Best Available Control Technology requirements for new major stationary sources of GHGs. It is the triggering of standards for stationary sources (power plants, manufacturing facilities, etc.) that has raised the most concern in Congress: legislation has been considered in both the House and Senate aimed at preventing EPA from implementing these requirements. In the first session of this Congress, the House passed H.R. 1, which contained provisions prohibiting the use of appropriated funds to implement various EPA GHG regulatory activities, and H.R. 910, a bill that would repeal EPA's endangerment finding, redefine "air pollutants" to exclude greenhouse gases, and prohibit EPA from promulgating any regulation to address climate change. In the Senate, H.R. 1 was defeated, and an amendment identical to H.R. 910 (S.Amdt. 183) failed on a vote of 50-50. EPA has taken action on a number of other air pollutant regulations, generally in response to court actions remanding previous rules. Remanded rules have included the Clean Air Interstate Rule (CAIR) and the Clean Air Mercury Rule-rules designed to control the long-range transport of sulfur dioxide, nitrogen oxides, and mercury from power plants through cap-and-trade programs. Other remanded rules included hazardous air pollutant ("MACT") standards for boilers and cement kilns. EPA is addressing the court remands through new regulations, that have now been promulgated. Many in Congress view the new regulations as overly stringent. The House has passed three bills (H.R. 2250, H.R. 2401, and H.R. 2681) to delay or revoke the new standards and change the statutory requirements for their replacements. In addition to the power plant and MACT rules, EPA is also reviewing ambient air quality standards (NAAQS) for ozone, particulates, and other widespread air pollutants. These standards serve as EPA's definition of clean air, and drive a range of regulatory controls. The revised NAAQS also face opposition in Congress. As passed by the House, H.R. 2401 would amend the Clean Air Act to require EPA to consider feasibility and cost in setting NAAQS, and H.R. 1633 would prevent EPA from setting standards for ambient concentrations of rural dust.

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 Congress, and has approved several bills that would overturn specific regulations or limit the agency's authority. Particular attention is being paid to the Clean Air Act, under which EPA has moved forward with the first federal controls on emissions of greenhouse gases and also addressed emissions of conventional pollutants from a number of industries. Environmental groups disagree that the agency has overreached, and EPA states that critics' focus on the cost of controls obscures the benefits of new regulations, which, it estimates, far exceed the costs; and it maintains that pollution control is an important source of economic activity, exports, and American jobs. Further, the agency and its supporters say that EPA is carrying out the mandates detailed by Congress in the federal environmental statutes. This report provides background information on recent EPA regulatory activity to help address these issues. It examines 40 major or controversial regulatory actions taken by or under development at EPA since January 2009, providing details on the regulatory action itself, presenting an estimated timeline for completion of the rule (including identification of related court or statutory deadlines), and, in general, providing EPA's estimates of costs and benefits, where available. The report includes tables that show which rules have been finalized and which remain under development. The report also discusses factors that affect the timeframe in which regulations take effect, including statutory and judicial deadlines, public comment periods, judicial review, and permitting procedures, the net results of which are that existing facilities are likely to have several years before being required to comply with most of the regulatory actions under discussion. Unable to account for such factors, which will vary from case to case, timelines that show dates for proposal and promulgation of EPA standards effectively underestimate the complexities of the regulatory process and overstate the near-term impact of many of the regulatory actions.

Attention to environmental issues in the 110th Congress focused early andheavily on climate change - the state of the science, and whether (and, if so, how)to address greenhouse gas (GHG) emissions. Seventeen bills had been introducedto establish GHG emission caps as of June 2008, and hearings on climate changewere held by at least 10 committees. The Lieberman-Warner bill to establish a cap-and-trade system for GHG emissions (S. 2191) was reported by the SenateEnvironment and Public Works Committee, May 20, 2008. Senate debate began ona modified version of the bill (S. 3036) June 2 but ended June 6, as the Senate failedto muster sufficient votes to invoke cloture.

This report provides information regarding pollution from ships and port facilities; discusses some of the measures being implemented and considered by local, state, and federal regulatory agencies; discusses the efforts to strengthen Annex VI of the International Convention for the Prevention of Pollution from Ships (MARPOL); and describes legislation in Congress to control emissions from ships, as well as efforts in Congress to address the applicability of proposed EPA regulations to ships on the Great Lakes.

This report summarizes the Clean Air Act and its major regulatory requirements. It excerpts, with minor modifications, the Clean Air Act chapter of CRS Report RL30798, which summarizes a dozen environmental statutes that form the basis for the programs of the Environmental Protection Agency.

Rapid growth in the use of computers and the incorporation of electronic features in a wide array of consumer products have been among the most important driving forces of the nation's economy during the last decade; but they also pose major potential environmental problems. In addition to producing better products, the improvements in technology have created growing volumes of obsolete products to be managed as waste. According to the National Safety Council, which undertook the first major effort to gather quantitative information on electronic product recycling, 55.4 million personal computers will become obsolete in the United States in 2002. At an average weight of 70 pounds, obsolete PCs weighing 3.878 billion pounds will be added to the supply of waste needing management in 2002 alone.