Research on Temporal and Spatial Distribution of PM_(10) in Yantai Urban Areas from 2006 to 2010

摘要

The purpose of this thesis is to study the characteristics of PM_(10) concentrations in the atmosphere over time granularity and spatial distribution in Yantai city. The concentration of PM_(10) is investigated in the daily from 2006 to 2010. The result shows that the characteristics of PM_(10) concentration in each time granularity are different: the interannual variation can be divided into two stages and the highest is approximately equal twice times of the lowest. The seasonal changes is distinct and the PM_(10) average concentration presents a feature that spring > winter > autumn > summer. And the highest month of PM_(10) is April, followed in March and May. The geographical distribution of PM_(10) is the center of pollution has been located in region A. Each region getting lowest in summer and the minimum one is region H where the concentration is 0.052mg/m~3. The function regions can be divided into two categories: most regions show same as the seasonal changes but the region A and G's characteristics change dramatically and the concentration of PM_(10) has come to 0.156 mg/m~3 in the winter.