Clear Skies Act of 2003

[AI summary unavailable — showing source text] Clear Skies Act of 2003 - Amends the acid deposition control provisions of the Clean Air Act with respect to emissions limitations and allowances programs for sulfur dioxide, nitrogen oxides, and mercury by: (1) revising the allowance system and associated transfer, tracking, permit, compliance plan, and penalty requirements, including those for auctions; and (2) establishing new emissions limitations and trading programs (including implementation of a separate sulfur dioxide scheme for States in the Western Regional Air Partnership). Requires the Administrator of the Environmental Protection Agency to: (1) promulgate performance standards (limiting emissions of sulfur dioxide, nitrogen oxides, particulate matter, and mercury) for new boilers, integrated gasification combined cycle plants, and combustion turbines; and (2) conduct a comprehensive research and environmental assessment program to enhance understanding of health and environmental effects of particulate matter and mercury and to demonstrate the efficacy of emission reductions under this Act. Excludes the following units from consideration as major emitting facilities or major stationary sources (or parts thereof) for pu…