Browsing by Author "Syabiha Shith"

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    Fluctuations in nighttime ground-level ozone concentrations during haze events in Malaysia
    (Springer, 2020) Syabiha Shith; Norrimi Rosaida Awang; Mohd Talib Latif; Nor Azam Ramli
    This study focused on O3 variations and the titration effects of NOx during nighttime at urban, industrial, sub-urban and background sites. Nighttime O3 concentration variations and the presence of high particles with an aerodynamic diameter of less than 10 μm (PM10) were examined because haze disturbs the photochemical reactions of O3. Hourly data on O3, NO2, NO and PM10 concentrations provided by the Air Quality Division of the Department of Environment were divided into two groups of daytime and nighttime and analysed.
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    Time effects of high particulate events on the critical conversion point of ground-level ozone
    (Elsevier, 2018) Norrimi Rosaida Awang; Nor Azam Ramli; Syabiha Shith; Noor Faizah Fitri Md Yusof; Nazatul Syadia Zainordin; Nurulilyana Sansuddin; Nurul Adyani Ghazali
    Particulate matter (PM), especially those with an aerodynamic particle size of less than 10 μm (PM10), is typically emitted from transboundary forest fires. A large-scale forest fire may contribute to a haze condition known as a high particulate event (HPE), which has affected Southeast Asia, particularly Peninsular Malaysia, for a long time. Such event can alter the photochemical reactions of secondary pollutants. This work investigates the influence of PM on ground-level ozone (O3) formation during HPE. Five continuous air quality monitoring stations from different site categories (i.e., industrial, urban and background) located across Peninsular Malaysia were selected in this study during the HPEs in 2013 and 2014.
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    Transformational characteristics of ground-level ozone during high particulate events in urban area of Malaysia
    (Springer, 2018) Norrimi Rosaida Awang; Nor Azam Ramli; Syabiha Shith; Nazatul Syadia Zainordin; Hemamalini Manogaran
    Observations of ground-level ozone (O3), nitric oxide (NO), nitrogen dioxide (NO2), particulate matter (PM10) and meteorological parameter (temperature, relative humidity and wind speed) fluctuations during high particulate event (HPE) and non-HPE in Malaysia have been conducted for 2 years (2013 and 2014). The study focuses on urban areas, namely, Shah Alam, Petaling Jaya and Bandaraya Melaka.