An investigation conducted by the Rural Development Administration of South Korea for sampled kosa showed that, although depending on the area, the samples included bacteria with a density of 7 to 22 times more than that of the ordinary air and mold with a density of 15 to 26 times that of the ordinary air.
韓国で同国の農村振興庁が黄砂を採取して行った検査では、地域差があるものの、細菌の濃度が通常の大気の7-22倍、カビの濃度が15-26倍と高かった。