Characteristics of color index and it's source indicator significant for atmospheric particulate matters

In this study,color indices of atmospheric particulate matters from Shanghai and the Northern Cities were researched to indicate their seasonal variations of atmospheric particulate matter and to analyze their effect factors and source indicator significant.The results showed that from Oct.2009 to Oct.2010,the seasonal variations of color indices of atmospheric particulate matters from three sampling points were consilient with each other,the rightness and redness of atmospheric particulate matters increased with time lapes,yellowness increased obviously during the time of dust storm,and decreased during the time of non-dust storm.The color indices of atmospheric particulate matters in spring from the Northern cities changed with time lapes,and its variation of yellowness had good correlation with atmospheric particulate matters from Shanghai,which indicated that the source region of atmospheric particulate matters in spring from different places were similar to each others.The characteristics of color indices of atmospheric particulate matters during the time of dust storm was in between the characteristics of non-dust storm and loess,which indicated that part of the materials in atmospheric particulate matters during the time of dust storm had the same source relation with the loess,part of the materials came from artifical sources.Therefor,color indices especially yellowness are the effective indices of source region indicating for atmospheric particulate matters during the time of dust storm.