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  1. Zakaria, S., Leman, A.M., Feriyanto, D., Hariri, A., Nazri, A.A.
    MyJurnal
    Concerns toward Indoor Air Quality (IAQ) in office building tend to risen since most people spend their working hours
    indoors compare to outdoors. Exposure to indoor pollutants is a considerable problem. Therefore, there is a need to monitor IAQ in
    order to deter further air quality deterioration in the workplace. The objective of this study is to determine the level of IAQ parameter
    in selected academic office. The important IAQ parameters considered in this study were the air temperature, air velocity, relative
    humidity, CO2, CO, TVOC, formaldehyde and respirable particulate matter. Measurements were conducted using commercial IAQ
    instruments. From the study it was found that the levels of TVOC and respirable particulate matter were higher than the recommended
    limit during photocopying activities. The formaldehyde, CO2 and CO level were observed to be acceptable for an office based on
    Industry code of practice on indoor air quality (ICOP-IAQ 2010). Results shows that the temperature and air velocity are located at
    acceptable value of 22-25 ºC and 0.1-0.1 m/s. Findings also show high relative humidity that exceeded the requirement level of 40%-
    70%. Detail investigations are needed in order to provide certain guidance in improvement of IAQ conditions in office environment.
  2. Hariri A, Paiman NA, Leman AM, Md Yusof MZ
    Iran J Public Health, 2014 Aug;43(8):1045-59.
    PMID: 25927034
    This study aimed to develop an index that can rank welding workplace that associate well with possible health risk of welders.
  3. Hariri A, Mohamad Noor N, Paiman NA, Ahmad Zaidi AM, Zainal Bakri SF
    Int J Occup Saf Ergon, 2018 Dec;24(4):646-651.
    PMID: 28849717 DOI: 10.1080/10803548.2017.1368950
    Welding operations are rarely conducted in an air-conditioned room. However, a company would set its welding operations in an air-conditioned room to maintain the humidity level needed to reduce hydrogen cracks in the specimen being welded. This study intended to assess the exposure to metal elements in the welders' breathing zone and toenail samples. Heavy metal concentration was analysed using inductively coupled plasma mass spectrometry. The lung function test was also conducted and analysed using statistical approaches. Chromium and manganese concentrations in the breathing zone exceeded the permissible exposure limit stipulated by Malaysian regulations. A similar trend was obtained in the concentration of heavy metals in the breathing zone air sampling and in the welders' toenails. Although there was no statistically significant decrease in the lung function of welders, it is suggested that exposure control through engineering and administrative approaches should be considered for workplace safety and health improvement.
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