Dear Colleagues,

Traffic-related air pollution, or TRAP, is one of the major risks to the atmospheric environment. Although cleaner on-road vehicle technologies are emerging on all fronts, the issue of TRAP still exists ubiquitously. While electric light-duty vehicles are emerging across the globe, heavy-duty vehicles, which dominate on-road NOx, VOCs, and PM emissions, are lagging behind on their electrification. Existing electric vehicles weigh more than their conventionally fueled counterparts due to heavy battery packs, generating more non-exhaust emissions from brakewear, tyrewear, and roadwear. Moreover, TRAP has been linked to multiple adverse health effects, while epidemiological studies have found that people that are exposed to higher TRAP concentrations are those with lower household stability and less accessibility to mobility services. The inequity problem is also revealed by the higher exposure of workers at specific positions, such as subway operators and bus drivers. Summarizing existing literature, we find the focus of TRAP research tends to shift from light-duty vehicles to heavy-duty vehicles, from tailpipe emissions to non-tailpipe emissions, from traffic-related air quality to a model-chain evaluation consisting of TRAP, public health, and inequity issues. We propose the Special Issue “Current Issues in Traffic-Related Air Quality and Associated Inequity Problems” to collect state-of-the-art research articles in the field with the hope of sharing views, findings, strategies, and recommendations on everyone's equitable access to clean air.

Dr. Ran Tu
Dr. Shunyao Wang
Dr. An Wang
Dr. Junshi Xu
Guest Editors

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• vehicle non-tailpipe emission measurement, modelling and visualization
• the impact of electric vehicles from the perspectives of air quality and health
• novel techniques in characterizing, assessing and improving traffic-related air quality (TRAQ)
• TRAQ research in developing regions with scarce data
• relationships between traffic-related air pollution (TRAP) and health impacts in developed and developing regions
• advancement in equitable TRAP management strategies, monitoring, and modelling
• identification and quantification of TRAQ-related inequity problems
• regional TRAQ improvement associated with carbon neutrality and smart city