State-of-the-art chamber facility for studying atmospheric aerosol chemistry

A state-of-the-art chamber facility is described for investigation of atmos pheric aerosol chemistry. Dual 28 m(3) FEP Teflon film chambers are used to simulate atmospheric conditions in which aerosol formation may occur. This facility provides the flexibility to investigate dark, single oxidant reac tions as well as full photochemical simulations. This pa per discusses the environmental control implemented as well as the gas-phase and aerosol-phas e instrumentation used to monitor atmospheric aerosol formation and growth, Physical processes occurring in the chamber and procedures for estimating secondary organic aerosol formation during reaction are described. Aerosol formation and evolution protocols at varying relative humidity conditions a re presented.