Air Quality Standards Have Room to Improve

This chapter focuses on the improvement of air quality in the United States. Laws such as the Clean Air Act (CAA), signed in 1970, resulted in a drastic reduction in air pollution. Since then, emissions have decreased by 50%. Despite these advances, adverse health effects associated with long-term exposure to air pollution continue. Researchers examined the health effects of pollution in a nationwide cohort of 61 million Medicare beneficiaries from 2000 to 2012. They created maps by linking Medicare mortality data, zip codes, and previously published estimates of ozone and fine particle pollutants (PM2.5). The study’s authors found that long-term exposures to fine particle pollutants and ozone, even at levels below current nationally “acceptable” standards, were associated with an increased risk of death. Persons with low incomes showed the highest risks associated with exposures. Vast improvements in air quality have been made in the past decades in the United States, but this study shows that air quality adhering to National Ambient Air Quality Standards still exposes Americans to levels of pollution that can be lethal over many years of exposure. Thus, air quality standards must be revisited in order to alleviate the burden on the most vulnerable populations.