1. EPA, US Environmental Protection Agency, Clean Air Act, 1970, 1990.
2. SCAQMD, South Coast Air Quality Management District, Historic Ozone Air Quality Trends, 2005; .
3. EPA, Latest Findings on National Air Quality, 2001 Status and Trends, EPA 454/K-02-001. Research Triangle Park, North Carolina, US EPA, Office of Air Quality Planning and Standards, Emissions, Monitoring, and Analysis Division, 2001.
4. CARB, California Air Resources Board, The Relationship Between Asthma and Air Pollution, 2006; .
5. IPCC, Intergovernmental Panel on Climate Change, Climate Change 2007: Mitigation of Climate Change, 2008; .