The Environmental Protection Agency has proposed to retain the current national ambient air quality standards for lead of 0.15 microgram per cubic meter. The agency, in a proposed rule signed by EPA Administrator Gina McCarthy Dec. 19, said the current health-based standard for lead, last revised in 2008, provides the requisite level of protection for public health with an adequate margin of safety. The EPA proposal would retain both the primary and secondary standards set in 2008. The 2008 review was the first time that the EPA revised the original standard of 1.5 micrograms per cubic meter, which was set in 1978.
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