Variations of surface ozone concentration across the Klang Valley, Malaysia. Atmospheric Environment, 61. ISSN 1352-2310 (2012)
Abstract
Hourly air quality data covering the period 2004e2008 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. Analysis of daily variations in surface O3 and the precursors e NO, NO2, CO, NMHC and UVb,
indicate that the surface O3 photochemistry in this study area exhibits a positive response to the intensity
and wavelength in UVb while being influenced by the concentration of NOx, particularly through tritration processes. Although results from our study suggested that NMHCs may influence the maximum
O3 concentration, further investigation is required. Wind direction during different monsoons was found
to influence the concentration of O3 around the Klang Valley. HYSPLIT back trajectories (�72 h) were
used to indicate the air-mass transport patterns on days with high concentrations of surface O3 in the
study area. Results show that 47% of the high O3 days was associated with the localized circulation. The
remaining 32% and 22% were associated with mid-range and long-range transport across the South China
Sea from the northeast.
| Item Type: | Article |
|---|---|
| Keywords: | Ozone temporal variation, Spatial variation, Precursors, HYSPLIT trajectory analysis |
| Taxonomy: | By Subject > Applied Sciences > Environmental Technology |
| Local Content Hub: | Subjects > Applied Sciences |
| Depositing User: | Mohd Fadhli Samsudin |
| Date Deposited: | 08 Apr 2021 08:39 |
| Last Modified: | 08 Apr 2021 08:39 |
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