EPA's said its proposal would strengthen the annual health standard for harmful fine particle pollution (PM2.5) to a level within a range of 13 micrograms per cubic meter to 12 micrograms per cubic meter. The current annual standard is 15 micrograms per cubic meter [See WIMS 9/21/06]. The proposed changes, which are consistent with the advice from the Agency's independent science advisors, are based on an extensive body of scientific evidence that includes thousands of studies -- including many large studies which show negative health impacts at lower levels than previously understood. By proposing a range, the agency will collect input from the public as well as a number of stakeholders, including industry and public health groups, to help determine the most appropriate final standard to protect public health. It is important to note that the proposal has zero effect on the existing daily standard for fine particles or the existing daily standard for coarse particles (PM10), both of which would remain unchanged.
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