Temperature Distribution and Air Pollution in Phnom Penh, Cambodia - Influence of Land Use and the Mekong and Tonle Sap Rivers

Masami Furuuchi; Takahiro Murase; Michiko Yamashita; Hideo Oyagi; Ken-ichi Sakai; Shinji Tsukawaki; Sotham Sieng; Mitsuhiko Hata

doi:10.4209/aaqr.2006.06.0003

Temperature Distribution and Air Pollution in Phnom Penh, Cambodia - Influence of Land Use and the Mekong and Tonle Sap Rivers

Masami Furuuchi ¹, Takahiro Murase¹, Michiko Yamashita¹, Hideo Oyagi², Ken-ichi Sakai¹, Shinji Tsukawaki³, Sotham Sieng⁴, Mitsuhiko Hata¹

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¹Graduate School of Natural Science and Technology, Kanazawa University, (null), Japan
²Earth Information Mathematical Sciences, Graduate School of Integrated Basic Sciences, Nihon University, (null), Japan
³Institute of Nature and Environmental Technology, Kanazawa University, (null), Japan
⁴Department of Geology, Ministry of Industry, Mines and Energy, (null), Cambodia

Received: May 31, 2006
Revised: May 31, 2006
Accepted: May 31, 2006
Download Citation: ||https://doi.org/10.4209/aaqr.2006.06.0003

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Cite this article:
Furuuchi, M., Murase, T., Yamashita, M., Oyagi, H., Sakai, K.i., Tsukawaki, S., Sieng, S. and Hata, M. (2006). Temperature Distribution and Air Pollution in Phnom Penh, Cambodia - Influence of Land Use and the Mekong and Tonle Sap Rivers. Aerosol Air Qual. Res. 6: 134-149. https://doi.org/10.4209/aaqr.2006.06.0003

ABSTRACT

The temperature distribution in Phnom Penh was measured using a car to evaluate the thermal characteristics and air pollution in the city. The measurements were made by using temp-hygro sensors with a data logger installed on the car roof and were conducted both during day and night to evaluate the influence of land use. The water temperature was also measured in the River Tonle Sap and the Mekong. By measuring the temperature as a function of distance from the banks of the Mekong and Tonle Sap, the cooling effect of the river was also investigated. Ambient particulates were simultaneously sampled at three different sites in the city along with NO₂ and PAHs and heavy metal concentrations were analyzed. The temperature distribution was compared with the concentration of chemical compositions and NO₂.

The maximum temperature difference, the so called heat island intensity, was observed during the daytime and was around 4-5°C, and was less than 2°C during the nighttime. The maximum and minimum temperatures respectively were observed in the southern part of the city and the river peninsula between the Tonle Sap river and the Mekong, and a strong cooling effect of river water was found. The water temperature was consistently lower than the ambient and temperature distributions perpendicular to the river and was found to increase with the distance from the riverbank, suggesting that inland areas were cooled to some extent. Comparison of the concentrations of anthropogenic PAHs and NO₂were found to be closely related to temperature.

Keywords: GIS; Urban air; Temperature measurement; Air pollutants; River temperature