Time series of daily averages of fine mode AOD at 500 nm (Version 2, V2) retrieved from SDA from January 1 – June 1, 2012 for AERONET sites at (a) Yonsei University, S. Korea (b) Baengnyeong, S. Korea (c) XiangHe, China and d) Fukuoaka, Japan. Note that days with only a red diamond (L1) and no black bar (L2) did not pass V2 Level 2 cloud screening.