A study by the Keck School of Medicine of USC found that the adoption of electric vehicles in California is linked to a reduction in air pollution, with a 1.1% decrease in nitrogen dioxide levels for every 200 additional zero-emissions vehicles. The study used satellite data to track changes in air pollution and found that the reduction in pollution is associated with improved public health. The researchers suggest that the transition to electric vehicles is already having a positive impact on air quality in California. The study's findings support the continued adoption of electric vehicles as a way to reduce air pollution and improve public health.