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The article reports on the United States Environmental Protection Agency's (EPA) proposal to tighten the clean air standard for ozone. It discusses the possibility that the EPA's proposal could leave the door open for the agency to bow to industry pressure for maintaining the status quo. The agency plans to accept comments from the public for maintaining the current standard or favoring a new ozone limit.

The article reports that the U.S. Supreme Court will hear disputes on two key environmental cases and a lawsuit over punitive damages against a company. The Court will decide whether the U.S. Environmental Protection Agency has the authority to regulate carbon dioxide, a greenhouse gas. On the other hand, a second Clean Air Act case is about the increasing annual emissions of Duke Energy Corp.

Reports on the insurance policy effort made by state officials to ensure that federal standards limiting emissions from diesel engines will go into effect as planned in 2007, despite pressure for delays by the trucking industry. Statement of S. William Becker, executive director of two groups of air regulators; Adoption of the standards account by the states for one-third of nationwide sales of heavy-duty diesel engines; Establishment of stringent emissions limits on heavy-duty diesel engines by the Environmental Protection Agency standards.

Reports on the examination conducted by the expert technical review panel about health effects related to air pollution from the collapse of World Trade Center buildings. Review of the results of sampling in cleaned-up residential areas near the World Trade; Recommendation of the Environmental Protection Agency to residents about the cleanup; Contact information.