Temporal trends of particle gross β-activity and PM_2.5 mass concentrations in USA during 2001-2017.

ABSTRACT: This paper investigates the temporal trends of particle gross β-activity (PM-β) and PM_2.5 mass in the 50 contiguous United State of America during the period of 2001-2017. With the implementation of stringent air pollution control policies, national ambient PM_2.5 concentrations decreased by 38.5% during this period. However, a smaller decrease of 9.4% was observed for PM-β; PM-β is mostly associated with radon emissions, which do not change much with time. The largest PM_2.5 and PM-β reductions were observed in the Southeast, while the smallest were found in the West. The overall PM-β to PM_2.5 ratio was 0.77 (0.64-0.88; 25^th-75^th percentile) and was higher when PM_2.5 levels were lower. The highest mean PM-β /PM

SUBMITTER: Matthaios VN 

PROVIDER: S-EPMC12029875 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature