Study on dry deposition of SO2-NOx onto loess

In order to obtain information on dry deposition of SO2 onto loess in China , the effects of water vapor and NO2 on SO2 deposition-oxidation processes were investigated in laboratory measurements. The deposition velocities of SO2 onto loess particles were 2.34-7.33 cm s(-1), were high in comparison w ith the other studies. Deposition of SO2 onto the particles was decreased w ith exposed time and amounts of SO2, but was influenced by adsorption of wa ter vapor onto the particles. On the other hand, oxidation of SO2 physicall y adsorbed was promoted by the coexistence of water vapor and NO2. So, it w as indicated that it was possible for water vapor and NO2 in the atmosphere to play an important role in dry deposition for the deposition-oxidation i nteraction between SO2 and loess particles.