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Author (up) Shith, S. & Ramli, N. A. url  openurl
  Title Night-time ground-level ozone trends and variability over the urban sites Type Journal Article
  Year 2019 Publication Journal of Sustainability Science and Management Abbreviated Journal  
  Volume 14 Issue 5 Pages 195-201  
  Keywords Atmospheric chemistry; air pollution  
  Abstract This study evaluates the variation of night-time ground-level ozone (O3), nitrogen dioxide (NO2 ) and nitric oxide (NO) from year 2015 to 2016. During this period, the recorded maximum night-time ground-level O3 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 O3 to remain in the atmosphere. The contributor toward night-time ground-level O3 concentration in the urban site was not only NO2 concentration, as light pollution might enhance the O3 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 O3 was also titrated at night even though the value is not as high as during the day.  
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  Notes Approved no  
  Call Number IDA @ intern @ Serial 2734  
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