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Aliphatic amines enter the atmosphere from a variety of sources, and exist in both gas and particle phases in the atmosphere. Similar to ammonia, amines can form inorganic salts through acid–base reactions. However, the atmospheric behavior of amines with atmospheric oxidants (e.g. the nitrate radical (NO₃), the hydroxyl radical (OH), O₃) is still poorly understood. In this study, chamber experiments were conducted to explore the reaction between three aliphatic amines and HNO₃/O₃/NO₃/OH. Effects of water vapor were also explored by conducting experiments under different relative humidity conditions (RH<0.1% to ∼40%). Results show that all three amines have a high potential to form secondary aerosol in reactions with NO₃, and are affected by the presence of water vapor. DEA and BA are capable of forming a significant amount of stable inorganic salt at ppb level concentrations, while TMA tends to form …