The aerosol number concentration have measured with an aerodynamic particle sizer spectrometer(APS) at Gosan in Jeju Island, which is known as background area in Korea, from March 2010 to February 2011. The obtained results of asian dust events and non-asian dust period have been compared.
The results show that the entire averaged aerosol number concentration from APS measurement during asian dust events and non-asian dust period are about 341 particles/㎝3 and 240 particles/㎝3, respectively. During asian dust events, the number concentration in small size ranges(≤0.4 ㎛) are similar to non-asian dust period, however, those in large size ranges(≥0.7 ㎛) are very higher than non-asian dust period.
The contributions of the size resolved number concentration(23 channel in 0.25∼10.0 ㎛) to total number concentration in that range are dramatically decreased with increased particle size. The contributions of smaller size ranges(≤0.4 ㎛) during asian dust events are very low compared with non-asian dust period, on the other hand, those of larger size ranges(≥0.4 ㎛) are higher than non-asian dust period.
total aerosol number concentration are depended on the number concentration in range of smaller than 0.58 ㎛ during non-asian dust period and asian dust events. On the other hand, PM10 mass concentration has mainly affected with the number concentration in range of smaller than 1.0 ㎛ during non-asian dust period, however, during asian dust events, the mass concentration has mainly affected with the number concentration in range of 0.65∼3.0 ㎛.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 측정지점
  2.2. 측정방법
 3. 결과 및 고찰
  3.1. 황사 시 에어로졸의 수농도 현황
  3.2. 황사기간과 비황사기간 중의 에어로졸 수농도 비교
  3.3. 황사 시 에어로졸 수농도의 입경분포 특성
 4. 결 론
 참 고 문 헌

• 강창희(제주대학교 화학과) | Chang-Hee Kang (Department of Chemistry, Jeju National University)
• 허철구(제주대학교 환경공학과) | Chul-Goo Hu (Department of Environmental Engineering, Jeju National University) Corresponding author