Lowering air pollution in Southern California and the San Joaquin Valley would save more lives annually than ending all motor vehicle fatalities in the two regions, according to a new study.

The study, which examined the costs of air pollution in two areas with the worst levels in the country, also said meeting federal ozone and fine particulate standards could save $28 billion annually in health care costs, school absences, missed work and lost income potential from premature deaths.

If pollution levels were to improve to federal standards, the study says residents of the two air basins would suffer 3,860 fewer premature deaths, 3,780 fewer nonfatal heart attacks and would miss 470,000 fewer days of work annually. School children would miss more than 1.2 million fewer days of school, a savings of $112 million in caregiver costs. There also would be more than 2 million fewer cases of upper respiratory problems.