Evaluation of the contribution of new particle formation to cloud droplet in urban atmosphere

This data was measured at the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (39.98◦ N, 116.39◦ E) from May 25, 2017 to June 18, 2017. The number size distribution of particles in the size range from 10 to 550 nm (scanned range) were measured with time resolution of 5 minutes by a scanning mobility particle sizer (SMPS) used to calculated the particles number concentration. And the non-refractory chemical composition of PM1 is measured by an Aerosol Chemical Speciation Monitor (ACSM) used to calculate the hygroscopicity parameters of aerosol particles and analyse it's source. The wind speed and wind direction data were download from National Climate Data Center （https://www.ncdc.noaa.gov/）, from 25 May to 15 June 2017.