Referring to the sampling specification of the AP-42 method (USEPA,2011),137 dust samples were collected from different types of roads in 13 urban districts of Wuhan,and the associated sampling area,traffic flow,lane conditions,geographical location,surrounding environment,and meteorological data were recorded.Based on this information,the dust load of different road types was determined,and the dust emission factors and the emissions from different roads were estimated.The results show that the dust load of Wuhan is in the following order:branch road > secondary trunk road > trunk road > expressway.The average dust load is 2.396 g/m² for branch roads and 0.852 g/m² for expressways.The average dust load in distant suburban areas of Wuhan is about twice the average dust load in the main urban area.The order of road traffic dust emission factors of different types of roads is:branch road > secondary trunk road > trunk road > expressway,which is consistent with the trend of dust load.In 2016,the annual emissions of road traffic dust source TSP,PM₁₀,and PM_2.5 were 156,931.4 tons,39,868.7 tons,and 11,574.8 tons,respectively.The uncertainty of road traffic dust TSP emissions ranged from -24.7% to 31.4%,the uncertainty of PM₁₀ emissions from -31.3% to 32.9%,and the uncertainty of PM_2.5 emissions from -31.8% to 30.5%.Of these,the main road dust emissions were the largest,and the annual emissions of TSP,PM₁₀,and PM_2.5 were 64,447.1 tons,16,372.9 tons,and 4,753.4 tons,respectively.