By reducing California's dependence on gasoline and diesel, Prop 87 will reduce air pollution that causes asthma, lung disease and cancer. California has the nation's worst air quality. By the age of two months, Los Angeles-area infants have already inhaled enough toxic pollutants to reach the EPA lifetime limit for cancer risk. Asthma causes 3.3 million school absences each year. 95% of Californians live in areas that fail to meet state and federal air quality standards.