Role of snow and cold environment in the fate and effects of nanoparticles and select organic pollutants from gasoline engine exhaustElectronic supplementary information (ESI) available: Additional details of methods and supplemental data, tables and figures are provided in the ESI. See DOI: 10.1039/c5em00616c

Exposure to vehicle exhaust can drive up to 70 % of excess lifetime cancer incidences due to air pollution in urban environments. Little is known about how exhaust-derived particles and organic pollutants, implicated in adverse health effects, are affected by freezing ambient temperatures and the presence of snow. Airborne particles and (semi)volatile organic constituents in dilute exhaust were studied in a novel low-temperature environmental chamber system containing natural urban snow under controlled cold environmental conditions. The presence of snow altered the aerosol size distributions of dilute exhaust in the 10 nm to 10 μm range and decreased the number density of the nanoparticulate (