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Qune) EPA proposed the clean air ozone implementation rule with options fox how areas would transition from the 1-hour ozone standard to the 8-hoax ozone standard. Quly) States and tribes recommended designations - 412 counties were 2003 included. (December) EPA responded to states and tribes describing intended modifications to their recommended designations - 506 counties were included. (December) EPA proposed the Clean Aix Interstate Rule to help azeas in the US meet the 8-hour ozone standard. 2004 (April 15) EPA finalized the Clean Aix Ozone designations and basic implementation rule. Qune) State plans fox meeting the health-based 8-hour ozone standard 2007 were submitted to EPA. Quly) EPA proposed revisions to the National Ambient Air Quality Standards (NAAQS) fox ground-level ozone. (U.S. Em~itonmental Protection Agency, httn/; n~~ns ens eo~~i aidozonepollurion/Iusrog.html, Accessed 9/7/0'1) *Ohio, Michigan And West Virginia Sued The Federal Government Over The 1997 Ground Level Ozone Standards, Delaying Implementation Of The New Rules For Several Years. "After years of legal wrangling, the government is poised to issue new rules on where and how to comply with tougher air quality standards that will affect the cleanup of smog in dozens of states. Some 470 counties in 31 states could be targeted by the Environmental Protection Agency regulations designed to reduce unhealthy levels of ground-level ozone or smog.... The standards allow less ozone in the air, from 120 parts per billion down to 85, and require more hours of sampling. They were delayed from taking effect for four years because of failed court challenges by the trucking, manufacturing and business groups as well as by the states of Michigan, Ohio and West Vlrglma." Qohn Hedptin, "EPA Regulations To Affect Smog Cleanup In 31 States," A.rm~iatedPrerr, 4/15/04) 5 C_I