Browsing by Author "Nadhira Dahari"

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    Chemical characterization and source apportionment of PM2.5 near semi-urban residential-industrial areas
    (Springer, 2022) Nadhira Dahari; Khalida Muda; Md Firoz Khan; Mohd. Talib Latif; Norelyza Hussein; Doreena Dominick
    This study aims to determine the concentrations of the trace metals (TM) and water soluble inorganic ions (WSII) of the PM2.5 pollutant collected in the suburban industrial-residential airshed during the southwest (SW), inter-monsoon (IM) and northeast (NE) monsoons in Skudai, Johor Bahru. The PM2.5 samples were collected using the MiniVol™ portable air sampler equipped with filter paper. The TM and WSII of PM2.5 were determined by using the inductively coupled plasma-mass spectrometry (ICP-MS) and ion chromatography (IC), respectively. The sources of the PM2.5 composition were determined using the Positive Matrix factorisation (PMF) and the origin of the measured air-masses were determined by the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT).
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    Seasonal variations of particle number concentration and its relationship with PM2.5 mass concentration in industrial-residential airshed
    (Springer, 2022) Nadhira Dahari; Khalida Muda; Mohd Talib Latif; Doreena Dominick; Norelyza Hussein; Md Firoz Khan
    The smaller particles that dominate the particle number concentration (PNC) in the ambient air only contribute to a small percentage of particulate matter (PM) mass concentration although present in high particle number concentration. These small particles may be neglected upon assessing the health impacts of the PM. Hence, the knowledge on the particle number concentration size distribution deserves greater attention than the particulate mass concentration. This study investigates the measurement of the particle mass concentrations (PM2.5) and PNC of 0.27 μm < Dp < 4.50 μm during the southwest (SW), inter-monsoon (IM) and northeast (NE) monsoons in the industrial-residential airshed of Skudai, Johor Bahru, Malaysia.