Author(s)

I.D. Longley, J.R. Dorsey, M.W. Gallagher, J.D. Allen, M.R. Alfarra & H. Coe

Abstract

Mass-based emission controls (such as Euro – I to IV) are successfully reducing emissions of fine particles from road vehicles, but may have actually increased the emission of ultrafine particles and their persistence in the atmosphere just at a time when growing evidence indicates that these ultrafine particles present the greatest threat to health upon inhalation. These particles have so little mass that they barely register in measurements made by the current urban air quality monitoring network, which measures the mass of particulate matter (PM10). Ultrafine particles also have different dynamic and transport properties to larger particles, leading to more variability in concentrations that may rise and fall inde

Keywords