Night-time ground-level ozone trends and variability over the urban sites

Nor Azam Ramli, . and Syabiha Shith, . Night-time ground-level ozone trends and variability over the urban sites. pp. 195-201. ISSN 1823-8556

This study evaluates the variation of night-time ground-level ozone (O‚) nitrogen dioxide (NO‚‚) and nitric oxide (NO) from year 2015 to 2016. During this period the recorded maximum night-time ground-level O‚ was 55 ppb at Putrajaya (PT) which have more areas with higher brightness level compared to another urban site Alor Setar (AS) at 21 ppb. Lower NO concentrations restricted the sinking agents thus reducing the depletion rates and resulted in O‚ to remain in the atmosphere. The contributor toward night-time ground-level O‚ concentration in the urban site was not only NO‚‚ concentration as light pollution might enhance the O‚ formations. The photochemistry rate was commonly accounted to be zero due to the absence of photochemical reactions at night. However the minimum photochemistry rate in both urban was recorded at the ranged from 1.50-2.70 ppb indicating that O‚ was also titrated at night even though the value is not as high as during the day.

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Abstract

This study evaluates the variation of night-time ground-level ozone (O‚) nitrogen dioxide (NO‚‚) and nitric oxide (NO) from year 2015 to 2016. During this period the recorded maximum night-time ground-level O‚ was 55 ppb at Putrajaya (PT) which have more areas with higher brightness level compared to another urban site Alor Setar (AS) at 21 ppb. Lower NO concentrations restricted the sinking agents thus reducing the depletion rates and resulted in O‚ to remain in the atmosphere. The contributor toward night-time ground-level O‚ concentration in the urban site was not only NO‚‚ concentration as light pollution might enhance the O‚ formations. The photochemistry rate was commonly accounted to be zero due to the absence of photochemical reactions at night. However the minimum photochemistry rate in both urban was recorded at the ranged from 1.50-2.70 ppb indicating that O‚ was also titrated at night even though the value is not as high as during the day.

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Item Type:	Article
AGROVOC Term:	Ozone
AGROVOC Term:	Air pollution
AGROVOC Term:	Evaluation
AGROVOC Term:	Ozone
AGROVOC Term:	Nitrogen dioxide
AGROVOC Term:	Nitric oxide
AGROVOC Term:	Urban areas
AGROVOC Term:	Sustainability
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8699

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