Browsing by Author "Anis Asma Ahmad Mohtar"

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    Spatio-temporal assessment of nocturnal surface ozone in Malaysia
    (Elsevier, 2019) Mohd Famey Yusoff; Mohd Talib Latifa; Liew Juneng; Md Firoz Khan; Fatimah Ahamad; Jing Xiang Chung; Anis Asma Ahmad Mohtar
    This study aims to determine the level and potential sources of nocturnal surface ozone (NSO) in different regions in Malaysia. Eleven-year (2005-2015) ozone data from 37 continuous air quality monitoring stations throughout Malaysia have been analysed to determine spatio-temporal variations in NSO concentrations. NSO daily maximum concentrations from different regions in Malaysia were used for seasonal variation analysis while linear regression and the Mann-Kendall trend test were used for the annual variation analysis.
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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.