Yangang REN, presently an Associate Researcher working on the atmospheric chemistry, aerosol formation and air quality at ICARE, CNRS, Orleans, France. During his research period of ICARE, he is the leading person responsible for operating and managing the third biggest outdoor simulation chamber HELIOS (90 m3) in Europe, which equipped with a range of in-situ and off-line analytical instrumentation (FTIR, PTR-TOF-MS, gas-aerosol phase HR-TOF-MS, CIMS for OH/RO2/H2SO4, CRDS ...)