Nanosized aerosol emissions from traffic

Researchers measured aerosol particles between 1.3 and 3.0 nanometers in diameter, a previously unmeasured size range of traffic emissions, in traffic, labeled the particles as nanocluster aerosols (NCA), and found that 20-54% of total particle concentrations in a semi-urban roadside environment in Helsinki, Finland were NCA, and that NCA concentrations varied with the rate of traffic and wind direction, findings with implications for human exposure to nanosized aerosol in urban areas and the condensation of atmospheric organic compounds.

Article #17-00830: “Traffic is a major source of atmospheric nanocluster aerosol,” by Topi Rönkkö et al.