Abstract:Growth of newly formed particles on Mount Huang in eastern China was investigated using the measured aerosol particle data, trace gas and meteorology data over the period from 22 September to 28 October, 2012. The new particle formation (NPF) events appeared on 6 out of 33 days, occurring before the noon of sunny days. Moreover, the occurrence frequency of the NPF events during sunny days was 37.5%. Compared with other days (non-NPF days), solar radiation, wind speed, SO2 and O3 concentrations were higher in NPF days on average with lower temperature and relative humidity (RH). The nucleation mode particle (10~20nm in diameters) concentrations increased first, and then the Aiken nuclei mode particle concentrations (20~50nm in diameters) increased over time. However, the peaks of large aerosol particle concentration were lower. The mean growth rate (GR) of the newly formed aerosol particles was estimated as 3.58nm/h. SO2 concentration reached the peak faster than nucleation mode particle number concentration does, and the oxidation of SO2 produced H2SO4 which was thought to participating in the particle nucleation as a kind of precursor. So the nucleation won’t appear under low concentration of SO2 even on sunny days.