To explore the contributions of chemical components in particulate matter Lhasa, size distribution characteristics components, such as carbonaceous species (organic carbon, OC; elemental EC), water-soluble ions (NH4+, Cl−, SO42−, and NO3−) trace elements (Na, Ca, Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, K, Mg, Pb), were investigated from August 2018 to May 2019. Principal component analysis (PCA) was...