Dear Colleagues,

This Special Issue is a follow-up of the first Special Issue entitled “Traffic-Related Emission” (https://www.mdpi.com/journal/atmosphere/special_issues/Traffic_Related_Emission) published in Atmosphere and will cover all aspects of traffic-related emission.

Globally, traffic-related emissions are critical in contributing to local air pollution issues. The increasing applications of cleaner fuels (including alternative fuels and traditional fuels meeting stricter standards) and emission control devices have largely alleviated the problem of traffic-related emissions. However, new challenges emerge, such as new toxic pollutants (ammonia, aldehydes, smaller exhaust particles, intermediate- and semi-VOCs), concerns over secondary contamination via atmospheric reactions, and life-cycle emission reduction capabilities. All these issues establish the necessity to continue engine emissions research, legislation, and policy assessment in this 'electrified' era.

The non-road sector is another source of air pollution but has been underestimated or unintendedly overlooked. Along with reducing on-road engine emissions, the impacts of non-road mobile machinery (NRMM) are attracting increasing focus. Especially with the outbreaks of several international incidents in the past few years, recent changes in marine emissions may significantly impact both global and coastal inventories.

In addition to engine emissions, non-exhaust emissions, primarily brake and tire particles from motor vehicles and rails, have been included or considered in the forthcoming regulations in Europe and China. Their control's priority may grow with the increase in gross vehicle weight and urban traffic congestion.

The scope of the second volume of this Special Issue will be consistent with the previous one, including all types of research on traffic-related emissions from motor vehicles, NRMMs, and non-exhaust sources (brake and tire wear particles as well as evaporative VOCs). In addition, new insights into the impacts of future vehicle technologies, including but not confined to electrification, hybridization, and e-fuels, on local air quality improvement and carbon footprint reduction are welcomed. Original research reporting cutting-edge technologies in emission control and fuel, life-cycle assessment of the carbon footprint, and forthcoming emission regulations with experimental data support are highly appreciated.

Dr. Xin Wang
Guest Editor

Manuscript Submission Information

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• traffic-related emission
• alternative fuel
• internal combustion engine
• motor vehicle
• non-road mobile machinery (NRMM)
• non-exhaust particles
• life-cycle assessment