http://archpedi.jamanetwork.com/ en-us Sat, 01 Dec 2012 00:00:00 GMT Tue, 01 Jan 2013 00:44:43 GMT Silverchair editor@archpedi.jamanetwork.com webmaster@archpedi.jamanetwork.com http://archpedi.jamanetwork.com/article.aspx?articleID=486077 Mon, 01 Aug 2005 00:00:00 GMT Bernstein AS, Abelson HT. <span class="paragraphSection">Last December, the Environmental Protection Agency (EPA) disclosed a list of counties across the nation that have had persistently unsafe levels of a specific kind of air pollution known as PM 2.5. PM 2.5 refers to air particles, made from a hodgepodge of metals, organic compounds, and other substances produced primarily from the combustion of fossil fuels, that are all less than 2.5 μm (or about one thirtieth the width of a human hair). About 95 million Americans (that’s roughly 1 in 3) breathe air deemed to be consistently higher than the EPA’s PM 2.5 air quality standards.</span> 159 8 786 786 10.1001/archpedi.159.8.786 http://archpedi.jamanetwork.com/article.aspx?articleID=486077