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Experts Outline Key Scientific Issues For EPA's Particulate NAAQS Review

机译:专家概述了EPA颗粒状NAAQS审查的关键科学问题

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EPA officials, university researchers and others say that key scientific and policy issues for the agency's latest review of its particulate matter (PM) national ambient air quality standards (NAAQS) include how to respond to new science on shorter-term exposures to the pollutant and better information on identifying the sources of PM. Whatever the agency decides in response to those issues could be central to its eventual decision on whether to revise or retain the existing fine particulate matter (PM2.5) NAAQS of 12 micrograms per cubic meter (ug/m3) set in 2012, which is stricter than the previous 15 ug/m3 standard issued in 1997. EPA in its 2012 rulemaking retained its prior separate NAAQS for larger coarse PM (PM10) of 150 ug/m3 over a 24-hour period.
机译:EPA官员,大学研究人员和其他人士表示,该机构对其颗粒物(PM)国家环境空气质量标准(NAAQS)进行最新审查的关键科学和政策问题包括如何应对有关短期接触污染物的新科学和有关识别PM来源的更好信息。对于最终决定是否修改或保留2012年设定的每立方米12微克(ug / m3)的现有细颗粒物(PM2.5)NAAQS,FDA对于这些问题做出的决定可能是决定性的核心。比1997年发布的之前的15 ug / m3标准更严格。EPA在2012年的规则制定中保留了其先前的单独的NAAQS,以便在24小时内获得150 ug / m3的较大粗颗粒PM(PM10)。

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