The Clean Air Scientific Advisory Committee's Particulate Matter Review Panel supports:
-- setting secondary PM standards in terms of light extinction values rather than mass concentration values, and
-- lowering current primary PM2.5 standards
BNA article
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1 comment:
No one knows how to fully implement existing PM10 and PM2.5 standards. Imagine having to perform visibility modeling for every PM2.5 standards demonstration.
I was just reading EPA's brand new tailoring rule for GHGs. They talk about an "administrative necessity" doctrine whereby "Congress is presumed...to intend that its statutory directives to agencies be administrable, and not to have intended to have written statutory requirements that are impossible to administer." Apparently this doctrine does not apply to EPA's regulations, because they seem routinely to promulgate rules that are either impossible or at least impractical to implement.
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