Time effects of high particulate events on the critical conversion point of ground-level ozone

Awang, Norrimi Rosaida; Ramli, Nor Azam; Shith, Syabiha; Yusof, Noor Faizah Fitri Md; Zainordin, Nazatul Syadia; Sansuddin, Nurulilyana; Ghazali, Nurul Adyani

doi:10.1016/j.atmosenv.2018.06.008

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…During nighttime, O3 concentrations for CMCO and RMCO is consistently showed values that were less than 10 ppb indicating very minimal O3 concentrations present in the air during the periods. Similar trends have also been reported by Awang et al [14] when investigating the influence of particulate matter (PM) on O3 formation during high particulate events. The study reported that the are shift in O3 critical conversion time due to the screening effect of a PM that promotes attenuation of sunlight.…”

Section: Diurnal Variationssupporting

confidence: 87%

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Impact of National Movement Control Orders toward Ground Level Ozone Concentrations in Shah Alam

Awang

Hussin

Nazir

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Malaysia is currently facing the COVID-19 pandemic which has claimed hundreds of innocent lives. Because of the health problems impose by the pandemic, the government has ordered to implement the movement control order (MCO) starting March 18, 2020. With this movement control order in place, people are not allowed to leave the house. Therefore, movement on the road can also be reduced. This study was conducted to investigate the emission concentrations of ground-level ozone into the air during MCOs in an urbanized area of Shah Alam. This secondary data of ground-level ozone (O3) was acquired from the Department of Environment in 2020 and interpreted using the methods of box and whisker plot, time series analysis, and diurnal variation plot. The results found that the concentrations of air pollutants in each type of MCOs implemented were different in terms of trends. During the early implementations of MCOs, results showed that there was a slight decrement in O3 concentrations and as MCOs periods continued, there higher decrements in O3 concentrations were observed. During the MCOs period, non-exceedance episodes were recorded which show the level of ground-level ozone was significantly improved result of the implementation of MCOs. Results also suggested there is a shift in the peak concentration time as the plot showed peak concentrations were reached between 4 to 6 p.m. which is quite later as normally peaks O3 concentrations were reported normally reached from 12 noon to 2 p.m. [13]

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Section: Diurnal Variationssupporting

confidence: 87%

“…The study reported that the are shift in O3 critical conversion time due to the screening effect of a PM that promotes attenuation of sunlight. Similar shifting might also contribute to changes in precursors concentrations [14].…”

Section: Diurnal Variationsmentioning

confidence: 99%

Impact of National Movement Control Orders toward Ground Level Ozone Concentrations in Shah Alam

Awang

Hussin

Nazir

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Overall, variations in O 3 at night have been studied, and the possible factors that contribute to the presence of O 3 at night have been analysed [14][15][16][17][18]. Nighttime O 3 variations are attributed to the weakening of vertical mixing at night [18] and the effects of emissions and meteorological factors [14][15][16]19,20].…”

Section: Introductionmentioning

confidence: 99%

Does Light Pollution Affect Nighttime Ground-Level Ozone Concentrations?

et al. 2022

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Ground-level ozone (O3) is mainly produced during daytime in the presence of ultraviolet (UV) light and later destroyed by nitrogen oxides during nighttime. However, light pollution caused by the excessive use of artificial lights may disrupt the chemistry of night-time ground-level O3 by providing enough energy to initiate nighttime ground-level O3 production. In this study, nighttime (7 p.m. to 7 a.m.) ground-level O3, nitrogen oxide (NO), and nitrogen dioxides (NO2) concentrations were observed for three years (2013, 2014, and 2015). The existence of O3 was found during nighttime, especially in urban areas with a concentration range of 8–20 ppb. The results suggested that nighttime variations of ground-level O3 concentrations were higher in urban areas than in suburban areas. The mean nighttime O3 concentration at urban sites varied, possibly because the distribution of anthropogenic lights around the urban sites is brighter than in suburban locations, as indicated by the data from the light-pollution map. This anthropogenic light has not caused the suspected nighttime photolysis processes, which directly slowed nighttime oxidation. The photochemistry rate of JNO2/k3 was supposed to be near zero because of the absence of photochemical reactions at night. However, the minimum concentration in all urban and suburban sites ranged from 2–3 ppb, indicating that O3 might also form at night, albeit not due to light pollution.

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“…Air pollution can be defined as the presence in the atmosphere of one or more contaminants in such quantities and for such duration as is injurious or tends to be injurious, to human health, human welfare, animal or plant life and the environment (Latif et al, 2012;Singal, 2012;Awang et al, 2018). Atmospheric pollution is caused by both natural and anthropogenic sources.…”

Section: Introductionmentioning

confidence: 99%

Comparison of O<sub>3</sub>, NO, NO<sub>2</sub> concentrations and meteorological parameters in urban, sub urban and rural residential area

Junaidi

Awang

Nazir

et al. 2021

JTRSS

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Ozone (O3) have many adverse impacts toward the living human, environment and O3 formed through the photochemical reaction with the aid of sunlight. Therefore, this study focused on the determination of O3, nitric oxide (NO), nitrogen dioxide (NO2) concentrations and meteorological parameters (temperature, humidity, wind speed and wind direction) three residential area namely Taman Tun Dr Ismail Jaya, Selangor as the urban area, Taman Delima, Sungai Petani, Kedah as the sub urban area and Taman Kifayah, Jeli, Kelantan as the rural area. The monitoring were continuously done for three days in 24 hours from 12 a.m. until 12 a.m. per day at each site. Aeroqual S500 series and weather station model RK900-01 were used to measure O3, NO, NO2 concentrations and meteorological parameters. The concentration of O3, NO, NO2 and the meteorological parameters were determined and O3 concentration was compared by one-way analysis of variance (ANOVA). Among the studied areas, the highest mean O3 concentration was recorded in Taman Delima, Sungai Petani with 35.2 ppb followed by Tun Dr Ismail Jaya with 33.3 ppb. Result suggested that sub urban areas showed higher mean O3 concentration compared to urban area which might linked to the availability of the O3 precursors in the area. As expected, the lowest mean O3 concentration recorded at Taman Kifayah, Jeli with 12.1 ppb as the area have limited O3 precursor’s sources. However, the ozone concentration at three residential areas were still under permissible level according to Recommended Malaysia Ambient Air Quality Guidelines (RMAAQ).

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Time effects of high particulate events on the critical conversion point of ground-level ozone

Cited by 9 publications

References 36 publications

Impact of National Movement Control Orders toward Ground Level Ozone Concentrations in Shah Alam

Impact of National Movement Control Orders toward Ground Level Ozone Concentrations in Shah Alam

Does Light Pollution Affect Nighttime Ground-Level Ozone Concentrations?

Comparison of O<sub>3</sub>, NO, NO<sub>2</sub> concentrations and meteorological parameters in urban, sub urban and rural residential area

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