Road traffic emission inventory for air quality modelling and to evaluate the abatement strategies: A case of Ho Chi Minh City, Vietnam

A road traffic Emission Inventory (EI) is generated for Ho Chi Minh City (HCMC), Vietnam. For generating the EI for road traffic sources, we used the new EMISENS model, which combines the top-down and bottom-up approaches. The bulk emission factors of traffic stem from another study that estimated the emission factors for HCMC by using an inverse air quality model method. The results show that the motorcycles are responsible for the bulk of traffic emissions (contributing 94% of CO, 68% of NMVOC, 61% of SO2 and 99% of CH4). Four scenarios for reducing of the traffic emissions are designed using the HCMC’s plan for reduction of emissions. Two scenarios are the reduction scenarios for the year of 2015 and 2020. In addition, two scenarios are the Business as Usual scenario for the year of 2015 and 2020. If the local government does not have any plan for reduction of emissions (scenario of Business as Usual) the emissions will increase rapidly. If the government follows the planning as set out by the local managers, the emissions of the city will decrease.

► We combined the top-down and bottom-up approaches for generating Emission Inventory.
► Motorcycles are responsible for the bulk of traffic emission (99%) in Ho Chi Minh City.
► Emission in 2015 will reduce 15% than 2006, If HCMC follows the planning for reduction.
► Emission in 2015 increases 30% than 2006, If HCMC does not have any plan for reduction.