High Nighttime Ground-Level Ozone Concentrations in Kemaman: NO and NO2 Concentrations Attributions

Awang, Norrimi Rosaida; Ramli, Nor Azam; Yahaya, Ahmad Shukri; Elbayoumi, Maher

doi:10.4209/aaqr.2015.01.0031

Cited by 39 publications

(30 citation statements)

References 39 publications

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“…Wind speed and direction are significant agent that controlling ozone transport and dilution in both daytime and night time Kim and Guldmann, 2011;Toh et al, 2013). Awang et al (2015) reported that high O 3 concentrations in Kemaman were observed that coincided with prevailing winds from the southerly direction. Kuantan is one of the biggest cities in east coast Peninsular Malaysia and characterized by high population and traffic density, numbers of industrials and residential establishments.…”

Section: Hacamentioning

confidence: 99%

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Awang

Elbayoumi

Ramli

et al. 2016

Aerosol Air Qual. Res.

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Critical conversion point (CCP) is a very crucial step in production of the ground level O 3 chemistry. Thus, a multivariate analysis was applied on the dataset of nine selected locations in Malaysia from 1999 to 2010. It incorporated hierarchical agglomerative cluster analysis (HACA) to explore the spatial variability of CCP and principal component analysis (PCA) to determine the major sources of the air pollutants that influence ozone CCP. High variability in CCP was observed between the monitoring stations that occurred during critical conversion time (CCT) from 8:00 a.m. to 11:00 a.m. The HACA results grouped the nine monitoring stations into three different clusters, based on the characteristics of ozone concentrations during CCT period. Results of PCA for the three clusters showed that the contributions to O 3 level variation during CCT by meteorological variables (UVB, temperature, relative humidity, and wind speed) are higher at 51.6%, 48.5%, and 33.3% than that of primary air pollutants (NO 2 , SO 2 , PM 10 ) at 19.2%, 21.4%, and 15.2% for cluster 1, cluster 2, and cluster 3, respectively. Therefore, applying a targeted spatial control strategy for ground level O 3 precursors during the CCT period is a crucial step.

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Section: Hacamentioning

confidence: 99%

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Awang

Elbayoumi

Ramli

et al. 2016

Aerosol Air Qual. Res.

Self Cite

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“…However, the concentration of O3 during night-time was far lower than the daytime concentration due to the absence of photochemical reactions. This is because during night-time O3 concentration had lower concentration due to no titration and also the deposition [1]. For the correlation between ground level O3 concentration with others parameters, Pearson correlation was used in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Tropospheric ozone (O3) is an important atmospheric constituent because it plays a main role as both an oxidant and a greenhouse gas [1,2]. Most of the O3 concentrations occupy in ozone layer; which is located in the middle of the stratosphere and acts as a protecting shield that protects Earth from any harmful radiation.…”

Section: Introductionmentioning

confidence: 99%

Temporal Characterisation of Ground-level Ozone Concentration in Klang Valley

2018

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Abstract. In Malaysia, ground-level ozone (O3) is one of the most significant air pollutants due to the increasing sources of ozone precursors. Hence, the surface O3 concentration should have received substantial attention because of its negative effects to human health, vegetation and the environment. In this study, hourly air pollutants dataset (i.e O3, Carbon monoxide (CO), Nitrogen dioxide (NO2), Particulate matter (PM10), Nonmethane hydrocarbon (NmHC), Sulphur dioxide (SO2)) and weather parameters (i.e. wind speed (WS), wind direction (WD), temperature (T), ultraviolet B (UVB)) for ten years period (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012) in Klang Valley were selected for analysis in this study. Two monitoring stations were selected that are Petaling Jaya and Shah Alam. The aim of the study is to determine the diurnal variations of O3 concentrations according to the seasonal monsoon and the correlation between the ground-level O3 concentration and others parameter. A high concentration of ground-level O3 was observed during the first transition (April to May) for both of the stations. While at a low surface, O3 concentration was found out during the southwest monsoon within June to September. Pearson correlation was used to find the correlation between the O3 concentration and all other pollutants and weather parameters. Most of the relationship between O3concentrationswas positively correlated with NO2 and negative relationship was found out with NMHC. These results were expected since these pollutants are known as the O3 precursors. Besides that, O3 concentration and its precursors show a positive significant correlation with all meteorological factors except for relative humidity.

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“…CCP is assumed to be the interception point between O 3 , NO 2 and NO line in the composite diurnal plot [10]. Generally, at the beginning of the plot, NO 2 concentration was high while O 3 concentration remained low due to NO x titration during nighttime [16]. Changes started to occur when entering CCT, starting around 8.00 a.m., due to the increasing solar radiation that triggers photochemical reactions.…”

Section: B Diurnal Variationsmentioning

confidence: 99%

Trends of Transformation Characteristics of Ground-Level Ozone in Urban Peninsular Malaysia

2019

IJRTE

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Ozone (O3 ) is the second prominent air pollution in Malaysia. The annual variation of ozone concentration depends upon several conditions such as the sources of its precursor, the land use type and meteorological parameter. This study aims to understand the trends and issues of transformation characteristics of O3 in 4 urban area (Shah Alam, Kajang, Johor Bahru and Kota Bharu) during specific critical conversion time (CCT) as well as to introduce the critical transformation time (CTT) of O3 in 4 selected continuous air quality monitoring stations (CAQMS) from the year 2000 to 2011. The identification of CTT for O3 formation was identified occurring between 8.00 a.m and 11.00 a.m., and the O3 uni-modal peaks usually after CTT at approximately between 12.00 p.m and 4.00 p.m. The results indicated that the CTT of O3 in the Kota Bharu is slightly earlier occurring between 8.00 a.m to 10.00 a.m whereas Shah Alam, Kajang and Johor Bahru the CTT later occurring between 10.00 a.m to 11.00 a.m. Only Kota Bharu recorded data was below 100 part per billion volume (ppbv), while Shah Alam, Kajang and Johor have recorded exceedances above 100 ppbv. This research elucidates that CTT is adequate to control ozone concentration. Ozone might exceed Recommended Ambient Air Quality Guideline (RMAAQC) unless nitrogen emissions are adequately managed, due to the detrimental effects for those who are at risk of respiratory health problems resulting from air pollution.

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High Nighttime Ground-Level Ozone Concentrations in Kemaman: NO and NO2 Concentrations Attributions

Cited by 39 publications

References 39 publications

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Temporal Characterisation of Ground-level Ozone Concentration in Klang Valley

Trends of Transformation Characteristics of Ground-Level Ozone in Urban Peninsular Malaysia

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