Enhanced sulfate formation during China's severe winter haze episode in January 2013 missing from current models

Abstract A regional haze with daily PM 2.5 (fine particulate matters with diameters less than 2.5 µm) exceeding 500 µg/m 3 lasted for several days in January 2013 over North China, offering an opportunity to evaluate models. Observations show that inorganic aerosols (sulfate, nitrate, and ammonium) ... View More