By U.S. EPA News | September 24, 2008 - 4:20 pm - Posted in Common
(9/25/2008 -- SAN FRANCISCO) The U.S. Environmental Protection Agency has redesignated the San Joaquin Valley air basin to attainment for the national ambient air quality standard for coarse particulate matter (PM-10) – also approving the PM-10 maintenance plan for the area
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