Browsing by Author "Haris Hafizal Abd Hamid"

Now showing 1 - 8 of 8
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    Ambient BTEX levels over urban, suburban and rural areas in Malaysia
    (Springer, 2019) Haris Hafizal Abd Hamid; Mohd Talib Latif; Mohd Shahrul Mohd Nadzir; Royston Uning; Md Firoz Khan; Narayanan Kannan
    Benzene, toluene, ethylbenzene and xylene isomers (BTEX) are volatile organic air pollutants of concern which arise from natural and anthropogenic sources. This study aims to determine and evaluate the BTEX levels in ambient air in selected areas of Malaysia, namely: Kuala Lumpur (KL-urban), Penang (PG-urban), Bangi (BG-suburban), Langkawi (LGK-suburban) and the Danum Valley (DV-rural). Active sampling with sorbent tubes was applied in this study and samples were analysed using thermal desorption (TD) coupled with gas chromatography-mass spectrometry (GC-MS).
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    BTEX compositions and its potential health impacts in Malaysia
    (Elsevier, 2019) Mohd Talib Latif; Fatimah Ahamad; Md Firoz Khan; Mohd Shahrul Mohd Nadzir; Murnira Othman; Mazrura Sahani; Muhammad Ikram Abdul Wahab; Noorlin Mohamad; Royston Uning; Seng Chee Poh; Muhammad Fais Fadzil; Justin Sentian; Norhayati Md Tahir; Haris Hafizal Abd Hamid
    This study aims to determine the composition of BTEX (benzene, toluene, ethylbenzene and xylene) and assess the risk to health at different sites in Malaysia. Continuous monitoring of BTEX in Kuala Lumpur City Centre, Kuala Terengganu, Kota Kinabalu and Fraser Hill were conducted using Online Gas Chromatograph.
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    Indoor generated PM2.5 compositions and volatile organic compounds: Potential sources and health risk implications
    (Elsevier, 2020) Siti Amira ‘Ainaa’ Idris; Marlia M. Hanafiah; Md Firoz Khan; Haris Hafizal Abd Hamid
    The aim of the present study was to investigate the potential sources of heavy metals in fine air particles (PM2.5) and benzene, toluene, ethylbenzene, and isomeric xylenes (BTEX) in gas phase indoor air. PM2.5 samples were collected using a low volume sampler. BTEX samples were collected using passive sampling onto sorbent tubes and analyzed using gas chromatography-mass spectrometry (GC-MS).
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    Observations of BTEX in the ambient air of Kuala Lumpur by passive sampling
    (Elsevier, 2020) Haris Hafizal Abd Hamid; Mohd Talib Latif; Royston Uning; Mohd Shahrul Mohd Nadzir; Md Firoz Khan; Goh Choo Ta; Narayanan Kannan
    Benzene, toluene, ethylbenzene and xylenes (BTEX) are well known hazardous volatile organic compounds (VOCs) due to their human health risks and photochemical effects. The main objective of this study was to estimate BTEX levels and evaluate interspecies ratios and ozone formation potentials (OFP) in the ambient air of urban Kuala Lumpur (KL) based on a passive sampling method with a Tenax® GR adsorbent tube. Analysis of BTEX was performed using a thermal desorption (TD)-gas chromatography mass spectrometer (GCMS). OFP was calculated based on the Maximum Incremental Reactivity (MIR).
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    PM2.5 and ozone in office environments and their potential impact on human health
    (Elsevier, 2020) Murnira Othman; Mohd Talib Latif; Chong Zin Yee; Lina Khalida Norshariffudin; Azliyana Azhari; Nor Diana Abdul Halim; Azwani Alias; Nurzawani Md Sofwan; Haris Hafizal Abd Hamid; Yutaka Matsumi
    It is important to have good indoor air quality, especially in indoor office environments, in order to enhance productivity and maintain good work performance. This study investigated the effects of indoor office activities on particulate matter of less than 2.5 μm (PM2.5) and ozone (O3) concentrations, assessing their potential impact on human health. Measurements of indoor PM2.5 and O3 concentrations were taken every 24 h during the working days in five office environments located in a semi-urban area. As a comparison, the outdoor concentrations were derived from the nearest Continuous Air Quality Monitoring Station.
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    Seasonal variation and size distribution of inorganic and carbonaceous components, source identification of size-fractioned urban air particles in Kuala Lumpur, Malaysia
    (Elsevier, 2022) Anas Ahmad Jamhari; Mohd Talib Latif; Muhammad Ikram A. Wahab; Hanashriah Hassan; Murnira Othman; Haris Hafizal Abd Hamid; Perapong Tekasakul; Worradorn Phairuang; Mitsuhiko Hata; Masami Furuchi; Nor Fadilah Rajab
    This study aims to determine the inorganic and carbonaceous components depending on the seasonal variation and size distribution of urban air particles in Kuala Lumpur. Different fractions of particulate matter (PM) were measured using a Nanosampler from 17 February 2017 until 27 November 2017. The water-soluble inorganic ions (WSIIs) and carbonaceous components in all samples were analysed using ion chromatography and carbon analyser thermal/optical reflectance, respectively.
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    Spatial distribution of fine and coarse particulate matter during a southwest monsoon in Peninsular Malaysia
    (Elsevier, 2021) Munira Othman; Mohd Talib Latif; Anas Ahmad Jamhari; Haris Hafizal Abd Hamid; Royston Uning; Md Firoz Khan; Mohd Shahrul Mohd Nadzir; Mazrura Sahani; Muhammad Ikram Abdul Wahab; Kok Meng Chan
    This study aimed to determine the spatial distribution of PM2.5 and PM10 collected in four regions (North, Central, South and East Coast) of Peninsular Malaysia during the southwest monsoon. Concurrent measurements of PM2.5 and PM10 were performed using a high volume sampler (HVS) for 24 h (August to September 2018) collecting a total of 104 samples. All samples were then analysed for water soluble inorganic ions (WSII) using ion chromatography, trace metals using inductively coupled plasma-mass spectroscopy (ICP-MS) and polycyclic aromatic hydrocarbon (PAHs) using gas chromatography-mass spectroscopy (GC-MS).
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    Volatile organic compounds and their contribution to ground-level ozone formation in a tropical urban environment
    (Elsevier, 2022) Mohd Faizul Hilmi Zulkifli; Nor Syamimi Sufiera Limi Hawari; Mohd Talib Latif; Haris Hafizal Abd Hamid; Anis Asma Ahmad Mohtar; Wan Mohd Razi Wan Idris; Nur Ili Hamizah Mustaffa; Liew Juneng
    This study aims to determine the trends of volatile organic compound (VOC) concentrations and their potential contribution to O3 formation. The hourly data (August 2017 to July 2018) for 29 VOCs were obtained from three Malaysian Department of Environment continuous air quality monitoring stations with different urban backgrounds (Shah Alam, Cheras, Seremban). The Ozone Formation Potential (OFP) was calculated based on the individual Maximum Incremental Reactivity (MIR) and VOC concentrations.