울산 지역에서 2001년 이후 이산화황(SO2)의 고농도 사례 분석과 저감 정책 방안의 검토

Abstract

Until comparatively lately, the annual time series of the <TEX>$SO_2$</TEX> concentration had been shown in a decreasing trend in Ulsan as well as other Korean cities. However, the high concentration of <TEX>$SO_2$</TEX> was frequently found in the specific countermeasure region including the national industrial complex such as Mipo and Onsan in the Ulsan city for the period of <TEX>$2001{\sim}2004$</TEX>. There are many conditions that can influence the high concentration of <TEX>$SO_2$</TEX> at monitoring sites in Ulsan, such as: First, annual usage of the fuel including sulfur increased in comparison with the year before in spite of the fuel conversion policy which wants to use low sulfur oil less than 3% and LNG. Second, point source, such as the power plants and the petroleum and chemistry stacks, was the biggest contributor in <TEX>$SO_2$</TEX> emission, as a analyzed result of both the air quality modeling and the stack tole-monitoring system (TMS) data. And third, the air pollutants that occurred in processes of homing and manufacturing of the fuel including sulfur were transported slow into a special monitoring site by accumulating along the frontal area of see-breeze. It was concluded that Ulsan's current environmental policy together with control methods should be changed into the regulation on total amount of emission, including a market-based emission trading with calculating of atmospheric environmental critical loads, for the <TEX>$SO_2$</TEX> reduction like the specific countermeasure for the <TEX>$O_3$</TEX> and PM10 reduction in the Seoul metropolitan area. And this change should be started in the big point sources of <TEX>$1{\sim}3$</TEX> species because they are big contributors of Ulsan's <TEX>$SO_2$</TEX> pollution. Especially it is necessary to revitalize of the self-regulation environmental management. Other control methods for sustaining the <TEX>$SO_2$</TEX> reduction are as follows: maintenance of the fuel conversion policy, reinforcement of the regional stationary source emission standard, and enlargement of the stack TMS.