title: Transport solutions for cleaner air.
abstract: In cities across the globe, road transport remains an important source of air pollutants that are linked with acute and chronic health effects. Decreasing vehicle emissions--while maintaining or increasing commuter journeys--remains a major challenge for city administrators. In London, congestion-charging and a citywide low-emission zone failed to bring nitrogen dioxide concentrations under control. In Beijing, controls on the purchase and use of cars have not decreased transport emissions to a sufficient extent. As cities continue to grow, not even zero-emission vehicles are the solution. Moving increasingly large numbers of people efficiently around a city can only be achieved by expanding mass transit systems.
authors.affiliation: National Institute for Health Research (NIHR), Heath Protection Research Unit in Health Impact of Environmental Hazards, MRC-PHE Centre for Environment and Health, King's College London, London SE1 9NH, UK. frank.kelly@kcl.ac.uk tzhu@pku.edu.cn.
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Kelly
authors.affiliation: State Key Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, and Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Peking University, Beijing 100871, China. frank.kelly@kcl.ac.uk tzhu@pku.edu.cn.
authors.forename: Tong
authors.initials: T
authors.lastname: Zhu
mesh_terms: D000393:Air Pollutants / Q000592:standards*; D000397:Air Pollution / Q000517:prevention & control*; D000068476:Beijing; D006801:Humans; D008131:London; D018986:Motor Vehicles / Q000592:standards; D011157:Population Dynamics; D014186:Transportation / Q000379:methods*; D001335:Vehicle Emissions / Q000517:prevention & control*
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions