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Non-refractory submicron aerosol is characterized using an Aerosol Chemical\udSpeciation Monitor (ACSM) in the fall and winter seasons of 2013 on the\udroadside in an Asian megacity environment in Hong Kong. Organic aerosol\ud(OA), characterized by application of Positive Matrix Factorization (PMF),\udand sulfate are found to be dominant. Traffic-related organic aerosol shows good\udcorrelation with other vehicle-related species, and cooking aerosol displays\udclear mealtime concentration maxima and association with surface winds from\udrestaurant areas. Contributions of individual species and OA factors to high\udNR-PM<sub>1</sub> are analyzed for hourly data and daily data; while cooking\udemissions in OA contribute to high hourly concentrations, particularly\udduring mealtimes, secondary organic aerosol components are responsible for\udepisodic events and high day-to-day PM concentrations. Clean periods are\udeither associated with precipitation, which reduces secondary OA with a\udlesser impact on primary organics, or clean oceanic air masses with reduced\udlong-range transport and better dilution of local pollution. Haze events are\udconnected with increases in contribution of secondary organic aerosol, from\ud30 to 50 % among total non-refractory organics, and the influence of\udcontinental air masses

atmospheric chemistry and physics

Continuous measurements at the urban roadside in an Asian megacity by Aerosol Chemical Speciation Monitor (ACSM): particulate matter characteristics during fall and winter seasons in Hong Kong