Long-term variations in PM_2.5 concentrations under changing meteorological conditions in Taiwan.

ABSTRACT: With emission control efforts, the PM_2.5 concentrations and PM_2.5 exceedance days (daily mean PM_2.5 concentrations >35 µg m^-3) show an apparent declining trend from 2006-2017. The PM_2.5 concentrations increase from the northern to southern part of western Taiwan, and reductions in the PM_2.5 concentration generally decrease from northern to southern part of western Taiwan. Thus, mitigation of the PM_2.5 problem is less effective in southwestern Taiwan than in other regions in Taiwan. Analysis of a 39-year ERA-interim reanalysis dataset (1979-2017) reveals a weakening of the East Asian winter monsoon, a reduction in northeasterly (NE) monsoonal flow, and a tendency of enhanced stably stratified atmospheric structures

SUBMITTER: Cheng FY 

PROVIDER: S-EPMC6488571 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature