Ozone
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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 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 Variation of ground-level ozone in the west coast of Peninsular Malaysia(Thai Society of Higher Eduation Institutes on Environment, 2018) Norazian Mohamed Noor; Nor Naimah Binti Mohamad; Nur Izzah Mohamad HashimHourly air pollutants data and weather parameters over the time period of 2008-2012 were obtained from the Air Quality Division, Department of Environment (DOE) Malaysia. The main aim of this study is to examine the variations of ground-level ozone in the west coast of Peninsular Malaysia. Shah Alam recorded the highest number of hours and days of ozone concentration above the threshold limit that was suggested by the Recommended Malaysian Air Quality Guidelines (RMAQG) with a maximum concentration of 0.158 ppm.Item Embargo A ten-year investigtion on ozone and it precursors at Kemaman, Terengganu, Malaysia(Thai Society of Higher Eduation Institutes on Environment, 2016) Marzuki Ismail; Samsuri Abdullah; Fong Si Yuen; Nurul Adyani Ghazali10 years of continuous monitoring data (2000-2010) from Air Quality Division, Malaysian Department of Environment are used to investigate the relationships between ambient levels of ozone (O3), nitric oxide (NO) and nitrogen dioxide (NO2) as a function of NOx, in Kemaman, Malaysia, wherewith the dominant sources of ozone precursors are industrial activities and road traffic. In addition, variation of oxidant OX (O3 and NO2) concentration with NOx was also examined.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.Item Embargo 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 JunengThis 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.Item Embargo Modelling and investigating the impacts of climatic variables on ozone concentration in Malaysia using correlation analysis with random forest, decision tree regression, linear regression, and support vector regression(Elsevier, 2022) Abdul-Lateef Balogun; Abdulwaheed TellaClimate change is generally known to impact ozone concentration globally. However, the intensity varies across regions and countries. Therefore, local studies are essential to accurately assess the correlation of climate change and ozone concentration in different countries. This study investigates the effects of climatic variables on ozone concentration in Malaysia in order to understand the nexus between climate change and ozone concentration. The selected data was obtained from ten (10) air monitoring stations strategically mounted in urban-industrial and residential areas with significant emissions of pollutants. Correlation analysis and four machine learning algorithms (random forest, decision tree regression, linear regression, and support vector regression) were used to analyze ozone and meteorological dataset in the study area.Item Embargo Multiple Linear Regression (MLR) and Principal Component Regression (PCR) for Ozone (O3) Concentrations Prediction(IOP Publishing, 2020) Nur Nazmi Liyana Mohd Napi; Mohammad Syazwan Noor Mohamed; Samsuri Abdullah; Amalina Abu Mansor; Ali Najah AhmedRapid economic growth has led to an increase in ozone (O3) concentration which significantly affecting human health and environment. The prediction of O3 is complicated due to the redundancy of influencing parameters which introduce the multicollinearity problem. The aim of this study is to assess the best prediction model for O3 concentration which is Multiple Linear Regression (MLR) and Principle Component Regression (PCR). Data from2012 to 2014 were used including O3, nitrogen dioxide (NO2), nitrogen oxide (O2), temperature, relative humidity and wind speed on hourly basis. Principle Component Analysis (PCA) was used in order to reduce multicollinearity problem, prior to the implementation of MLR. The hybrid model of PCR was selected as best -fitted models as it had higher correlation coefficient, R2 values compared with MLR model.Item Embargo Chaotic analysis and short-term prediction of ozone pollution in Malaysian urban area(IOP Publishing, 2017) Nor Zila Abd Hamid; Mohd Salmi Md Noorani; Nur Hamiza AdenanThis study focuses on the analysis and prediction of hourly ozone (O3) pollution in one of Malaysian urban area namely Shah Alam through chaotic approach. This approach begins by detecting the chaotic behavior of the O3 pollution using phase space plot and Cao method. Then, the local mean approximation method is used for prediction purposes. The O3 pollution observed at Shah Alam is detected as chaotic in behavior. Due to the chaotic behavior, only short-term prediction is allowed. Thus, the one-hour ahead prediction is done through the local mean approximation method.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 Multiple regression analysis in modeling of columnar ozone in Peninsular Malaysia(Springer, 2014) K. C. Tan; H. S. Lim; M. Z. Mat JafriThis study aimed to predict monthly columnar ozone (O3) in Peninsular Malaysia by using data on the concentration of environmental pollutants. Data (2003-2008) on five atmospheric pollutant gases (CO2, O3, CH4, NO2, and H2O vapor) retrieved from the satellite Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) were employed to develop a model that predicts columnar ozone through multiple linear regression.Item Embargo Anthropogenic and Biogenic Volatile Organic Compounds and Ozone Formation Potential in Ambient Air of Kuala Lumpur, Malaysia(IOP Publishing, 2019) H H A Hamid; M H M Hazman; M S M Nadzir; R Uning; M T Latif; N KannanThe measurement of anthropogenic and biogenic volatile organic compounds (VOCs) in urban air is important because of their toxic effects and because they can produce secondary air pollutants (e.g. ozone, particulate matter). Benzene, toluene, ethylbenzene and xylenes (BTEX), representing anthropogenic VOCs (AVOCs), and isoprene, a biogenic VOC (BVOC), were monitored at an urban site in Kuala Lumpur (KL). Active sampling was conducted using sorbent tubes packed with Tenax甌A/1 TD for 5 days (daytime). Analysis of VOCs was performed using Thermal Desorption-Gas Chromatography Mass Spectrometry (TD-GCMS).Item Embargo Variation of surface ozone exceedance around Klang Valley, Malaysia(Elsevier, 2014) Fatimah Ahamad; Mohd Talib Latif; Rosy Tang; Liew Juneng; Doreena Dominick; Hafizan JuahirThe total hourly surface ozone (O3) exceedance from the 100 ppbv hourly O3 standard set by the Department of Environment Malaysia (DOE) was analysed, as elevated O3 concentrations pose health risks to humans and harms vegetation. Air quality data from 2008 to 2010 were obtained from a total of seven stations located around the west coast of Peninsular Malaysia.Item Embargo Madden Julian oscillation modulation for surface ozone in Peninsular Malaysia(Elsevier, 2020) Mary Angelina Jud; Liew Juneng; Fredolin T. Tangang; Mohd Talib Latif; Jing Xiang Chung; Fatimah AhamadThis study investigates the modulation of Madden-Julian Oscillation (MJO) on surface ozone (O3) variability in Peninsular Malaysia. A 17-years (2000-2016) record of daily maximum surface ozone (O3Max) concentration from 24 air quality monitoring stations across Peninsular Malaysia were divided into six sub-regions namely R1, R2, R3, R4, R5 and R6. To investigate MJO modulation on O3Max, total cloud cover (TCC), surface air temperature (SAT) and surface wind from ERA Interim Reanalysis were also analyzed.Item Embargo 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 MohtarThis 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.Item Embargo Combining multiple regression and principal component analysis for accurate predictions for column ozone in Peninsular Malaysia(Elsevier, 2013) Jasim M. Rajab; M.Z. MatJafri; H.S. LimThis study encompasses columnar ozone modelling in the peninsular Malaysia. Data of eight atmospheric parameters [air surface temperature (AST), carbon monoxide (CO), methane (CH4), water vapour (H2Ovapour), skin surface temperature (SSKT), atmosphere temperature (AT), relative humidity (RH), and mean surface pressure (MSP)] data set, retrieved from NASA's Atmospheric Infrared Sounder (AIRS), for the entire period (2003-2008) was employed to develop models to predict the value of columnar ozone (O3) in study area. The combined method, which is based on using both multiple regressions combined with principal component analysis (PCA) modelling, was used to predict columnar ozone. This combined approach was utilized to improve the prediction accuracy of columnar ozone. Separate analysis was carried out for north east monsoon (NEM) and south west monsoon (SWM) seasons.Item Embargo The influence of meteorological factors and biomass burning on surface ozone concentrations at Tanah Rata, Malaysia(Elsevier, 2013) Ying Ying Toh; Sze Fook Lim; Roland von GlasowThe surface ozone concentrations at the Tanah Rata regional Global Atmosphere Watch (GAW) station, Malaysia (4°28′N, 101°23′E, 1545 m above Mean Sea Level (MSL)) from June 2006 to August 2008 were analyzed in this study. Overall the ozone mixing ratios are very low; the seasonal variations show the highest mixing ratios during the Southwest monsoon (average 19.1 ppb) and lowest mixing ratios during the spring intermonsoon (average 14.2 ppb). The diurnal variation of ozone is characterised by an afternoon maximum and night time minimum. The meteorological conditions that favour the formation of high ozone levels at this site are low relative humidity, high temperature and minimum rainfall. The average ozone concentration is lower during precipitation days compared to non-precipitation days. The hourly averaged ozone concentrations show significant correlations with temperature and relative humidity during the Northeast monsoon and spring intermonsoon. The highest concentrations are observed when the wind is blowing from the west.Item Embargo Variations of surface ozone concentration across the Klang Valley, Malaysia(Elsevier, 2012) Mohd Talib Latif; Lim Shun Huey; Liew JunengHourly air quality data covering the period 2004-2008 was obtained from the Air Quality Division, the Department of Environment (DOE) through long-term monitoring by Alam Sekitar Sdn. Bhd. (ASMA) were analysed to investigate the variations of surface ozone (O3) in the Klang Valley, Malaysia. A total of nine monitoring stations were selected for analysis in this study and the results show that there are distinct seasonal patterns in the surface O3 across the Klang Valley. A high surface O3 concentration is usually observed between January and April, while a low surface O3 concentration is found between June and August.Item Embargo Distribution ozone concentration in Klang Valley using GIS approaches(IOP Publishing, 2017) A Sulaiman; A A Ab Rahman; K N Abdul Maulud; M T Latif; F Ahmad; M A Abdul Wahid; M A Ibrahim; N D Abdul HalimToday, ozone has become one of the main air pollutants in Malaysia. The high ozone precursor concentrations have been encouraging the ozone production. The development of the Klang Valley, Malaysia has many types of physical activities such as urban commercial, industrial area, settlement area and others, which has increased the risk of atmospheric pollution. The purpose of this paper is to determine the spatial distribution between types of land use and ozone concentration that are occurred in the year 2014. The study areas for this paper include Shah Alam, Kajang, Petaling Jaya and Port Klang.Distribution of ozone concentration will be showed via spatial analysis tools in Geographic Information Systems (GIS) approached and the types of land use will be extracted using Remote Sensing technique.Item Embargo Seasonal and long term variations of surface ozone concentrations in Malaysian Borneo(Elsevier, 2016) Mohd Talib Latif; Doreena Dominick; Fatimah Ahamad; Nur Shuhada Ahamad; Md Firoz Khan; Liew Juneng; Chung Jing Xiang; Mohd Shahrul Mohd Nadzir; Andrew D. Robinson; Marzuki Ismail; Mohammed Iqbal Mead; Neil R.P. HarrisMalaysian Borneo has a lower population density and is an area known for its lush rainforests. However, changes in pollutant profiles are expected due to increasing urbanisation and commercial-industrial activities. This study aims to determine the variation of surface O3 concentration recorded at seven selected stations in Malaysian Borneo. Hourly surface O3 data covering the period 2002 to 2013, obtained from the Malaysian Department of Environment (DOE), were analysed using statistical methods.