Browsing by Author "Doreena Dominick"

Now showing 1 - 9 of 9
  • Thumbnail Image
    ItemEmbargo
    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).
  • Thumbnail Image
    ItemEmbargo
    Composition of selected heavy metals in road dust from Kuala Lumpur city centre
    (Springer, 2014) Nur Mun’im Mohd Han; Mohd Talib Latif; Murnira Othman; Doreena Dominick; Noorlin Mohamad; Hafizan Juahir; Norhayati Mohd Tahir
    This study was carried out in order to determine the concentration of heavy metals, e.g., lead (Pb), cadmium (Cd), copper (Cu), zinc (Zn), iron (Fe), manganese (Mn), nickel (Ni) and chromium (Cr) in road dust in Kuala Lumpur's city centre. Samples were collected from four sampling locations, each of which had four sampling points and three replications.
  • Thumbnail Image
    ItemEmbargo
    Long term assessment of air quality from a background station on the Malaysian Peninsula
    (Elsevier, 2014) Mohd Talib Latif; Doreena Dominick; Fatimah Ahamad; Md Firoz Khan; Liew Juneng; Firdaus Mohamad Hamzah; Mohd Shahrul Mohd Nadzir
    Rural background stations provide insight into seasonal variations in pollutant concentrations and allow for comparisons to be made with stations closer to anthropogenic emissions. In Malaysia, the designated background station is located in Jerantut, Pahang. A fifteen-year data set focusing on ten major air pollutants and four meteorological variables from this station were analysed. Diurnal, monthly and yearly pollutant concentrations were derived from hourly continuous monitoring data. Statistical methods employed included principal component regression (PCR) and sensitivity analysis.
  • Thumbnail Image
    ItemEmbargo
    Seasonal and long term variations of surface ozone concentrations in Malaysian Borneo
    (Elsevier, 2016) Mohd Talib Latif; Doreena Dominick; Fatimah Ahamad; Nur Shuhada Ahamad; Md Firoz Khan; Liew Juneng; Chung Jing Xiang; Mohd Shahrul Mohd Nadzir; Andrew D. Robinson; Marzuki Ismail; Mohammed Iqbal Mead; Neil R.P. Harris
    Malaysian Borneo has a lower population density and is an area known for its lush rainforests. However, changes in pollutant profiles are expected due to increasing urbanisation and commercial-industrial activities. This study aims to determine the variation of surface O3 concentration recorded at seven selected stations in Malaysian Borneo. Hourly surface O3 data covering the period 2002 to 2013, obtained from the Malaysian Department of Environment (DOE), were analysed using statistical methods.
  • Thumbnail Image
    ItemEmbargo
    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.
  • Thumbnail Image
    ItemEmbargo
    Spatial assessment of air quality patterns in Malaysia using multivariate analysis
    (Elsevier, 2012) Doreena Dominick; Hafizan Juahir; Mohd Talib Latif; Sharifuddin M. Zain; Ahmad Zaharin Aris
    This study aims to investigate possible sources of air pollutants and the spatial patterns within the eight selected Malaysian air monitoring stations based on a two-year database (2008-2009). The multivariate analysis was applied on the dataset. It incorporated Hierarchical Agglomerative Cluster Analysis (HACA) to access the spatial patterns, Principal Component Analysis (PCA) to determine the major sources of the air pollution and Multiple Linear Regression (MLR) to assess the percentage contribution of each air pollutant.The HACA results grouped the eight monitoring stations into three different clusters, based on the characteristics of the air pollutants and meteorological parameters.
  • Thumbnail Image
    ItemEmbargo
    Spatial assessment of air quality patterns in Malaysia using multivariate analysis
    (Elsevier, 2012) Doreena Dominick; Hafizan Juahir; Mohd Talib Latif; Sharifuddin M. Zain; Ahmad Zaharin Aris
    This study aims to investigate possible sources of air pollutants and the spatial patterns within the eight selected Malaysian air monitoring stations based on a two-year database (2008-2009). The multivariate analysis was applied on the dataset. It incorporated Hierarchical Agglomerative Cluster Analysis (HACA) to access the spatial patterns, Principal Component Analysis (PCA) to determine the major sources of the air pollution and Multiple Linear Regression (MLR) to assess the percentage contribution of each air pollutant.
  • Thumbnail Image
    ItemEmbargo
    Variation of surface ozone exceedance around Klang Valley, Malaysia
    (Elsevier, 2014) Fatimah Ahamad; Mohd Talib Latif; Rosy Tang; Liew Juneng; Doreena Dominick; Hafizan Juahir
    The total hourly surface ozone (O3) exceedance from the 100 ppbv hourly O3 standard set by the Department of Environment Malaysia (DOE) was analysed, as elevated O3 concentrations pose health risks to humans and harms vegetation. Air quality data from 2008 to 2010 were obtained from a total of seven stations located around the west coast of Peninsular Malaysia.
  • Thumbnail Image
    ItemEmbargo
    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.