A series of reports prepared by the Special Investigations Division were the first studies to analyze levels of hazardous air pollutants -- and the health risks they generate -- based on current monitoring data. The reports found that many people may be exposed to hazardous air pollutants at levels that are hundreds of times higher than the goals of the Clean Air Act. The report on exposure to hazardous air pollutants in Los Angeles, which the Special Investigations Division prepared for Rep. Waxman, is representative of these reports.