|
KMID : 0382420000260040141
|
|
Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.141 ~ p.147
|
|
|
Study on Effect of NO2 Photodissociation rate on Ozone concentration from Rural and Urban Area in the Winter
|
|
Lee Jeong-Joo
Lee Dong-Bum
Yoon Jung-Sub
|
|
|
Abstract
|
|
|
|
Due to a rapid rise in automobiles since the 1980´s, the concentration of NO, and HC has also increased along with cases of VOCs. These air pollutants have created O_3 concentration, which cause a harmful effect to the human health. This issue has become a subject of great public interest. For this paper, to compare the concentration of O_3, NO, NO_2 between the rural and urban area in the winter, the concentrations of each have been measuredevery hour during Jan. ~Feb. 2000, 1998, respectively. To calculate the Photochemical Steady State, Φ = J_NO2[NO_2]/k_1[NO][O_3], temperature and J_NO2 has been determined. The NO concentration in the rural area showed at below 10 ppb while the NO concentration in the urban area showed the maximum value of 90~120 ppb. But the O_3 concentration in both areas showed less than 30 ppb. The reason is that the NO_2 photodissociation rate is low due to the temperature being below 2℃ and less than 60 degrees in the solar zenith angle during the winter time, which makes the O_3 concentration in both areas, similar in the concentration level. NO_2 photodissociation rate in both areas showed the maximum value of 3.0 mW/㎠. Values of Φ determined from the rural area was consistently the unity, approaching 1. Butvalues of Φ determined from the urban was roughly higher than unity, approaching above 1 or 2 for clear sky-high sun(10:00~16:00).
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|