Abstract
Over the last few decades, the annual air pollutants from internal combustion engine (ICE) vehicles have dropped significantly, benefiting from the implementation of strict emission regulations and the development of vehicle technology. Nitrogen oxides (NOx) and particulate matter (PM) emissions from transport sectors contributed more than 32% and 12% of annual total emissions. Although hazardous exhaust emissions from ICE vehicles will be reduced after the bans on ICE vehicle sales in 2030, sustainable technology development of ICE vehicles is still necessary to meet the future challenges. After-treatment retrofitting technology and Inspection/Maintenance (I/M) are particularly important measures to deal with the deterioration of engines and after-treatment systems.
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•Great success of drop ICE vehicle emissions has been achieved by the UK.•PM and NOx emissions are the main concerns of ICE vehicle emissions.•M/I and retrofit technology of after treatment will be the main measures.