Did the July 1, 2004 rulemaking finalize regulations for all aspects of implementing the new standards?
No. Two aspects of conformity for the PM2.5 standard were not finalized. The first was provisions to address how PM2.5 precursors will be addressed in conformity analyses. EPA published final conformity rule amendments that address PM2.5 precursors on May 6, 2005, which are available at: http://www.epa.gov/fedrgstr/EPA-AIR/2005/May/Day-06/a9086.htm. The preamble to the May 6, 2005 final rule contained two minor errors. Corrections were published in the Federal Register on June 1, 2005, and are available at: http://www.epa.gov/fedrgstr/EPA-AIR/2005/June/Day-01/a10853.htm. The second aspect was provisions to address if and how hot-spot analysis requirements should apply for PM2.5. On December 13, 2004, EPA issued a supplemental notice of proposed rulemaking that provides additional options to address localized PM2.5 emissions, as well as PM10 emissions. This supplemental proposal is available at: http://www.epa.gov/fedrgstr/EPA-AIR/2004/December/Day-13/a27171.htm. EPA is currently consid
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