In the latter half of the 20th century, Los Angeles had, by many measures, higher levels of photochemical air pollutants than any other major city in the United States (Figure 1). To address this problem, the California Air Resources Board and its partners became leaders in quantifying the health effects of air pollutants and in aggressively implementing pollution-control strategies.

Published Mar 5, 2015

Douglas W. Dockery, Sc.D., and James H. Ware, P. D. (2014). Cleaner Air, Bigger Lungs. New England Journal of Medicine, 1–2. https://doi.org/10.1056/NEJMsa1201918.6.