Figure 2.

The frequencies of the aerosol model types used in the VIIRS_EDR at Beijing, XiangHe and Xinglong. Urban(P) is the polluted urban aerosol model, Urban(C) is the clean urban aerosol model, Smoke(LA) is the low absorption smoke aerosol model, Smoke(HA) is the high absorption smoke aerosol model, and the last aerosol model is for Dust.