EPA has published a provisional assessment of recent studies on the health effects of particulate matter exposure. The assessment finds that new studies of fine and coarse particles document adverse effects at lower concentrations than the studies reviewed in the 2004 Criteria Document.
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White House Office of Management and Budget (OMB) regulatory chief John Graham has targeted EPA’s particulate matter research program in a “prompt letter” dated December 4, 2001.
The letter urges EPA to retarget their PM research program to focus on specific components of particulate matter that may be responsible for health problems.
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