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The SAPHIR chamber (Simulation of Atmospheric PHotochemistry In a large Reaction chamber), with its large volume-to-surface ratio, minimizes wall losses and uniquely uses natural sunlight exposure to simulate real-world atmospheric oxidation over representative time scales. Its large volume also allows for simultaneous sampling by a comprehensive suite of over 20 instruments monitoring the chemical and physical properties of gases and aerosols, which will enable a detailed characterization of the chemical pathways leading to urban SOA formation.
