To better investigate the characteristics and sources of trace elements (TEs) in PM2.5 in urban Beijing, a 1-year hourly observation was continuously made using an online multi-element analyzer from 1 June 2016 to 31 May 2017. The average concentrations of 14 individual TEs ranged from 1.1 (V) to 900 ng/m(3) (K). The occurrence levels of most TEs o...
