Source: http://en.ilmatieteenlaitos.fi/science-news-archive/-/asset_publisher/5UiQ/content/recent-study-examined-vertical-profile-of-particles?redirect=http%3A%2F%2Fen.ilmatieteenlaitos.fi%2Fscience-news-archive%3Fp_p_id%3D101_INSTANCE_5UiQ%26p_p_lifecycle%3D0%26p_p_state%3Dnormal%26p_p_mode%3Dview%26p_p_col_id%3Dcolumn-2%26p_p_col_count%3D1%26_101_INSTANCE_5UiQ_advancedSearch%3Dfalse%26_101_INSTANCE_5UiQ_keywords%3D%26_101_INSTANCE_5UiQ_delta%3D100%26p_r_p_564233524_resetCur%3Dfalse%26_101_INSTANCE_5UiQ_cur%3D2%26_101_INSTANCE_5UiQ_andOperator%3Dtrue