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Generally, mobile sources of air pollution were classified in on-road and non-road. Due to increased registration number of construction equipment in Korea, updated emission factors for non-road mobile sources, such as construction machinery, should be developed. NONROAD model of U.S. EPA already has introduced transient adjustment factors and sulfur adjustment factors for emission factors of diesel powered engine. In addition to this, European Environment Agency (EEA) has proposed emission factors for off-road machinery including several types of construction equipment. In this study, six types of construction equipment, such as excavator, forklift, loader, crane, roller and bulldozer, were studied to estimate emission factors based on total registration status in Korea. Total 445 construction equipments between 2004 and 2007 model year were tested with KC1-8 mode and air pollutants (CO, THC, NO<SUB>x</SUB> and PM) were measured. After statistical estimation and calculation, emission factors for CO, THC, NO<SUB>x</SUB> and PM for excavator, forklift, loader, crane, roller and bulldozer were provided and compared with previous emission factors. Moreover, updated emission factors for six types of construction equipment in this study were verified after comparison with emission factors of U.S. EPA. Finally, estimated emission amounts of four air pollutants were suggested according to six types of construction equipment.

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Abstract
1. 서론
2. 연구 방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-539-018486623