In order to better understand the impact of atmospheric particulate matter from different sources on the air quality in Beijing and to aid in the development of air pollution control plans,108 aerosol samples were collected from Beijing during the summer of 2014 and winter of 2015,and the samples were analyzed with scanning electron microscopy-energy dispersive X-ray(SEM-EDX) technology.The results showed the calcium-sulfate and carbonaceous particles significantly increased during hazy days.The amount of f...