A comprehensive field campaign regarding atmospheric aerosol and chemistry was conducted in suburban Tianjin,from July 11 to August 14,2009.The dataset of particle number size distributions(0.02–1.00 μm in diameter) was analyzed and parameterized,and was further studied with respect to its diurnal variation and relations with meteorological parameters such as wind speed and wind direction.The hourly-averaged integrated number and volume concentrations are 1.7×104 cm 3and 59 μm3/cm3 respectively.A diurnal va...