The atmospheric boundary layer is an important region where pollutants are influenced by interaction with the surface sources and large vertical variations may exist. At present, the vertical observations within the boundary layer are more focused on the concentrations and are characterized by limited spatial resolutions. Unmanned aerial vehicles are used to simultaneously collect particles at the Yangmeikeng Ecological Monitoring Center (YMK) in Shenzhen. The samples are analyzed by SEM/EDX single-particle technique and grouped into different types according to elemental composition. Particles collected in YMK (coastal site) are more affected by the ocean source where the proportion of sea salt particles is higher. It shows a clear diurnal variation where the contribution of sulfur-containing particles increase in the early afternoon. An increase in sea salt particles is contributed to the sea breezing at night. The results show the particles are well-mixed within the boundary layer, especially at nighttime and an increase in the mixing state index was observed.