LEGAL
• References to air quality websites
• Expanded and reorganized description of EPA visibility impairment regulations
• Coverage of EPA final Tier II standard implementing the next cut in tailpipe emissions
• Developments on acid rain permits regulation; court action rejecting legal challenges to the 1999 NOx NSPS rules
• Analysis of EPA's proposal to use the CAA residual risk authority to set TMDLs to control airborne toxics
• Coverage of policy on compliance incentives for small businesses
• Description of changes in regulations governing ozone-depleting substances
• Material describing an unsuccessful judicial challenge to EPA's credible evidence rule
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