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Between the 1989 to 1991 and 2009 to 2011 observation periods, wet deposition of sulfate decreased by more than 55 percent on average across the eastern United States. hip hop skull chicago bears football team full over printed shirt  For example, new coal-fired power plants typically install control devices that capture up to 98 percent of the sulfur dioxide and in many cases 90 percent of the nitrogen oxide emissions, relative to uncontrolled levels. Environmental effects of air pollution include damage to plants and long-term forest health, soil nutrient deterioration, accumulation of toxics in the food chain, damage to fish and other aquatic life in lakes and streams, and nitrogen enrichment of coastal estuaries causing oxygen depletion and resulting harm to fish and other aquatic animal populations.

A peer-reviewed EPA study issued in March 2011 found that the Clean Air Act Amendments of 1990 are achieving large health benefits that will grow further over time as programs take full effect. The Clean Air Act has a proven record of public health and environmental protection since 1970. 8. Ibid., p. 98. Congress can disavow an intent to preempt certain categories of state law by including a “savings clause” to that effect in federal statutes, see, e.g., 29 U.S.C. §1144, or by allowing federal administrative agencies to grant “preemption waivers” to states in certain circumstances, see 42 U.S.C. §7543. 3. EPA modified the ozone standard, specified in the statute as 0.12 parts per million averaged over a one-hour period, to 0.08 ppm averaged over an eight-hour period, through regulations promulgated in July 1997. In April 2004, the agency promulgated an implementation rule for the new eight-hour standard. Under this rule, the one-hour standard was revoked as of June 15, 2005,