Measurement of Nitrogen Dioxide Concentration in Traffic Areas of Nakhon Si Thammarat Province and Health Risk Assessment

Main Article Content

Rungruang Janta
Chuthamat Rattikansukha
Jenjira Kaewrat
Surasak Sichum

Abstract

Nitrogen dioxide is one of the important air pollutants emitted from the internal combustion of a vehicle. This gas is a direct cause of inflammation in the respiratory tract, and it is a precursor of groundlevel ozone and particulate matter, which are indirectly associated with adverse health effects. Nitrogen dioxide is also a source of acid rain which damages the ecological system. Nakhon Si Thammarat province is the rapid growth of the economy because of tourism promotion. Traffic density in Nakhon Si Thammarat has increased, then traffic air pollutants also become greater in this province. This study aims to measure the concentration of nitrogen dioxide in traffic areas of Mueang Nakhon Si Thammarat District in summer and rainy season by using a passive sampler. The concentration is then applied to assess risk of nitrogen dioxide exposure for residents living near road. The result shows that concentrations of the gas in urban areas were in the range 27.4–63.3 μg/m3. They were greater than that at the sub-urban area (13.6–17.5 μg/m3) for 4 and 2 times in summer and rainy season, respectively. The high relative humidity and rainfall were removed air pollutants in the rainy season. However, the toxicological risk quotients distinguished urban residents exposed to nitrogen dioxide over the recommended limits to human health.

Article Details

Section
Applied Science Research Articles

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