New Boundary May Include North Front Range Counties Sources in many counties may cause or contribute to violations Weld County and RMNP monitors are perilously close to recording violations EPA recommends 11 counties as the 8-hour ozone nonattainment area Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Elbert, Jefferson, Larimer, Morgan and Weld CDPHE responded to EPA proposal Shave off northern Larimer and Weld Counties, all of Elbert County, and eastern Morgan, Weld, Adams, and Arapahoe Counties from boundary
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