Browsing by Author "Matthews, James C"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Particle number concentration measurements on public transport in Bangkok, Thailand
    (Multidisciplinary Digital Publishing Institute (MDPI), 2023) Shallcross, Dudley E; Matthews, James C; Chalida, Chompoobut; Navasumrit, Panida
    Traffic is a major source of particulate pollution in large cities, and particulate matter (PM) level in Bangkok often exceeds the World Health Organisation limits. While PM2.5 and PM10 are both measured in Bangkok regularly, the sub-micron range of PM, of specific interest in regard to possible adverse health effects, is very limited. In the study, particle number concentration (PNC) was measured on public transport in Bangkok. A travel route through Bangkok using the state railway, the mass rapid transport underground system, the Bangkok Mass Transit System (BTS) Skytrain and public buses on the road network, with walking routes between, was taken whilst measuring particle levels with a hand-held concentration particle counter. The route was repeated 19 times covering different seasons during either morning or evening rush hours.
  • Thumbnail Image
    Item
    Urban tracer dispersion and infiltration into buildings over a 2-km scale
    (Springer Nature, 2020) Matthews, James C; Wright, Matthew D; Martin, Damien
    Field experiments were undertaken in the summer of 2015 in Manchester, UK, to investigate the dispersion behaviour and infiltration into buildings of gas-phase pollutants over horizontal distances of 1–5 km. Inert cyclic perfluorocarbon tracers were released for 15 min at either one or three release points and samples taken in locations indoors and outdoors up to 2 km downwind. Background measurements of these cyclic perfluorocarbons range between 5.6 and 12.6 parts per quadrillion (ppq).