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Pollutants during haze and Asian dust storms are transported out of the Asian continent, affecting the regional climate and the hydrological and biogeochemical cycles. Understanding the physicochemical properties of aerosol particles is essential to quantify their impacts. In order to determine physicochemical properties of aerosols before leaving the Asian continent, we carried out a field campaign from 14 April to 2 May 2011 at a background site in the path of Asian dust and haze outflows. We measured concentrations of gaseous pollutants (SO₂, NO₂, NO, O₃, and CO), black carbon (BC), and particle number in situ and collected airborne particles for microscopic analysis. Pollutant concentrations (BC, 4 µg m⁻³; CO, 808 ppb; SO₂, 24 ppb; NO₂, 37 ppb) were highest during haze periods, except for PM_2.5 mass, which was highest (162 µg m⁻³) during a dust storm. Seventy‐one percent of haze particles …