Bennett JE, Tamura-Wicks H, Parks RM, et al. - Researchers directly determined the health and longevity influences of current PM_2.5 concentrations and the advantages of decreases from 1999 to 2015, nationally and at the county level, for the whole contemporary population of the contiguous United States. PM_2.5 pollution in excess of the least noted concentration was accountable for an estimated 15,612 and 14,757 deaths in females and males, respectively, in the main model, which adjusted for these covariates and for unobserved county features through the use of country-specific random intercepts. These deaths would decrease national life expectancy by an estimated 0.15 and 0.13 years, respectively, for women and for men. Greatest life expectancy loss because of PM_2.5 was observed around Los Angeles and in some southern states such as Arkansas, Oklahoma, and Alabama. Life expectancy loss was, on average, greater in counties with lower income and higher poverty rates in comparison with wealthier counties, at any PM_2.5 concentration. In all but 14 counties where PM_2.5 progressed slightly, decreases in PM_2.5 since 1999 have reduced mortality. Therefore, the current decreases in particulate matter pollution in the United States led to public health advantages. However, current concentrations were correlated with mortality influences and loss of life expectancy, with greater influences in counties with lower income and higher poverty rates.