Browsing by Author "Matthew J. Ashfold"

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    Source apportionment and health risk assessment among specific age groups during haze and non-haze episodes in Kuala Lumpur, Malaysia
    (Elsevier, 2017) Nor Azura Sulong; Mohd Talib Latif; Md Firoz Khan; Norhaniza Amil; Matthew J. Ashfold; Muhammad Ikram Abdul Wahab; Kok Meng Chan; Mazrura Sahani
    This study aims to determine PM2.5 concentrations and their composition during haze and non-haze episodes in Kuala Lumpur. In order to investigate the origin of the measured air masses, the Numerical Atmospheric-dispersion Modelling Environment (NAME) and Global Fire Assimilation System (GFAS) were applied. Source apportionment of PM2.5 was determined using Positive Matrix Factorization (PMF). The carcinogenic and non-carcinogenic health risks were estimated using the United State Environmental Protection Agency (USEPA) method. PM2.5 samples were collected from the centre of the city using a high-volume air sampler (HVS).
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    The effects of synoptic and local meteorological condition on CO2, CH4, PM10 and PM2.5 at Bachok Marine Research Station (BMRS) in Peninsular Malaysia
    (Springer, 2020) Noraini Mohyeddin; Azizan Abu Samah; Sheeba Nettukandy Chenoli; Matthew J. Ashfold; Mohammed Iqbal Mead; David Oram; Mohd Talib Latif; Sivaprasad P.; Mohd Fadzil Firdzaus Mohd Nor
    This study is focused on Bachok Marine Research Station (BMRS) which is exposed to different scales of meteorological condition during the northeast (NE) and southwest (SW) monsoons. BMRS experiences both synoptic and land–sea breeze events during the NE monsoon, but only the land-sea breezes are dominant during the SW monsoon. Two case studies were investigated in which the first case study (CS1) was conducted from 25 to 27 January 2016 while the second one (CS2) from 3 to 5 June 2016.
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    Wavelet-based time series model to improve the forecast accuracy of PM10 concentrations in Peninsular Malaysia
    (Elsevier, 2015) Doreena Dominick; Mohd Talib Latif; Liew Juneng; Md Firoz Khan; Norhaniza Amil; Mohammed Iqbal Mead; Mohd Shahrul Mohd Nadzir; Phang Siew Moi; Azizan Abu Samah; Matthew J. Ashfold; William T. Sturges; Neil R.P. Harris; Andrew D. Robinson; John A. Pyle
    Particle mass concentrations (PM10, PM2.5 and PM1) and particle number concentration ((PNC); 0.27 μm ≤ Dp ≤ 34.00 μm) were measured in the tropical coastal environment of Bachok, Kelantan on the Malaysian Peninsula bordering the southern edge of the South China Sea. Statistical methods were applied on a three-month hourly data set (9th January to 24th March 2014) to study the influence of north-easterly winds on the patterns of particle mass and PNC size distributions.