Browsing by Author "Nor Azam Ramli"
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Item Embargo Air quality predictions using log normal distribution functions of particulate matter in Kuala Lumpur(Environmental Management Society Malaysia, 2006) Jannatul Naemah Mohamed Sedek; Nor Azam Ramli; Ahmad Shukri YahayaMalaysia's capital city of Kuala Lumpur has been developed from a small settlement at the confluence of the Klang and Gombak rivers into a vibrant and bustling metropolis. The associated rapid economic growths have started to impose costs in terms of industrial pollution and the degradation of urban environment. Air pollution is a major issue in this city that has been affecting human health, agricultural crops, forest species, and ecosystems. This paper reports findings of a research aimed at developing a tool needed to analyze the statistical characters of air quality data in Kuala Lumpur, Malaysia. In this study, the theoretical distribution Log Normal was used to fit the parent distribution of PM10 for 1998 and 2002 for Kuala Lumpur.Item Embargo Diurnal fluctuations of ozone concentrations and its precursors and prediction of ozone using multiple linear regressions(Environmental Management Society Malaysia, 2010) Nor Azam Ramli; Nurul Adyani Ghazali; Ahmad Shukri YahayaThe chemical reaction of pollutants emitted into the atmosphere leads to a variety of oxidized products, which are commonly referred to as secondary pollutants. Ground level ozone is a known secondary photochemical pollutant of major importance possessing detrimental effects on health, agriculture, natural/urban ecosystems and materials. Ozone (O3) can irritate lung airways and cause inflammation much like sunburn. Hourly and monthly variations of O3 and their precursors-nitrogen oxides (NOx) and meteorological parameters (temperature and wind speed) were presented using time series plots.Item Embargo Effect of Monsoonal Period toward Night-time Ground Level Ozone in East Coast Malaysia(IOP Publishing, 2020) Amni Umirah Mohamad Nazir; Norrimi Rosaida Awang; Nor Azam Ramli; Shaparas Daliman; Hasifah Abdul AzizThis study aims to identify the effect of monsoonal period toward nighttime ground level ozone in East Coast Malaysia depending on different land use area which is industrial and urban areas. The concentration of O3, NO, NO2 temperature (T), relative humidity (RH) and wind speed (WS) were used and collected from Air Quality Division of the Department of Environment, Malaysia. The data proceeded in descriptive analysis and statistical analysis. Temperature, relative humidity and wind speed parameters (symbol of East Coast Monsoonal period), was compared with O3, NO and NO2 concentration with Pearson correlation analysis.Item Embargo Fluctuations in nighttime ground-level ozone concentrations during haze events in Malaysia(Springer, 2020) Syabiha Shith; Norrimi Rosaida Awang; Mohd Talib Latif; Nor Azam RamliThis 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.Item Embargo Future daily PM10 concentrations prediction by combining regression models and feedforward backpropagation models with principle component analysis (PCA)(Elsevier, 2013) Ahmad Zia Ul-Saufie; Ahmad Shukri Yahaya; Nor Azam Ramli; Norrimi Rosaida; Hazrul Abdul HamidFuture PM10 concentration prediction is very important because it can help local authorities to enact preventative measures to reduce the impact of air pollution. The aims of this study are to improve prediction of Multiple Linear Regression (MLR) and Feedforward backpropagation (FFBP) by combining them with principle component analysis for predicting future (next day, next two-day and next three-day) PM10 concentration in Negeri Sembilan, Malaysia.Item Embargo Issues of air pollution in environmental impact assessment of development projects(Environmental Management Society Malaysia, 2002) Nor Azam Ramli; Peter W Athern; Moho Rizal RazmanThe aim of this study is to establish the trends in approaches and techniques being used to address the air pollution issues in project-related development. The interest was to look at the overall issues of air pollution and how it was dealt with in the context of Environmental Impact Assessment (EIA). However, the review was not based upon individual Environmental Impact Assessment techniques. Twenty eight samples from four different sectors were reviewed and information pertaining to construction activities, baseline condition, impact predictions and mitigating measures were extracted and analyzed.Item Embargo Level of benzene concentrations emitted from motor vehicles in various sites in Nibong Tebal, Malaysia(Springer, 2011) Wesam Ahmed Al Madhoun; Nor Azam Ramli; Ahmad Shukri Yahaya; Noor Faizah Fitri Md Yusuf; Nurul Adyani Ghazali; Nurulilyana SansuddinBenzene is classified as carcinogenic compound which is emitted mainly from cars. In this study, benzene was measured at various sites in Nibong Tebal (urban, suburban, town, and rural) of different traffic volume, and traffic counts were performed simultaneously. Monitoring was carried out during the morning and afternoon traffic peaks. The aim of this study is to monitor benzene concentration at several development sites with different traffic flow. The monitoring was done by using indoor air quality meter.Item Embargo Monsoonal differences and probability distribution of PM10 concentration(Elsevier, 2010) Noor Faizah Fitri Md Yusof; Nor Azam Ramli; Ahmad Shukri Yahaya; Nurulilyana Sansuddin; Nurul Adyani Ghazali; Wesam al MadhounThere are many factors that influence PM10 concentration in the atmosphere. This paper will look at the PM10 concentration in relation with the wet season (north east monsoon) and dry season (south west monsoon) in Seberang Perai,Malaysia from the year 2000 to 2004. It is expected that PM10 will reach the peak during south west monsoon as the weather during this season becomes dry and this study has proved that the highest PM10 concentrations in 2000 to 2004 were recorded in this monsoon.Item Embargo Statistical analysis of PM10 concentrations at different locations in Malaysia(Elsevier, 2011) Nurulilyana Sansuddin; Nor Azam Ramli; Ahmad Shukri Yahaya; Noor Faizah Fitri MD Yusof; Nurul Adyani Ghazali; Wesam Ahmed Al MadhounMalaysia has experienced several haze events since the 1980s as a consequence of the transboundary movement of air pollutants emitted from forest fires and open burning activities. Hazy episodes can result from local activities and be categorized as "localized haze". General probability distributions (i.e., gamma and log-normal) were chosen to analyze the PM10 concentrations data at two different types of locations in Malaysia: industrial (Johor Bahru and Nilai) and residential (Kota Kinabalu and Kuantan).Item Embargo 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 GhazaliParticulate 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.Item Embargo 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 ManogaranObservations 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.