Prof. Peter DeCARLO from Drexel University visited LAP3 on June 17th 2013. Prof. DeCARLO is a top expert in aerosol mass spectrometry. He is one of the inventors of the data analyzer software for high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS). Prof. DeCARLO delivered a report entitled “Field and Laboratory investigations of the sources and processing of organic Aerosol” to the researchers and students at LAP3. He also expected the potential research cooperation between the two sides.