ANALYSIS ON THE SPATIAL AND TEMPORAL DISTRIBUTION OF PM2. 5 IN BEIJING IN 2013

This paper analyzed the spatial and temporal distribution of PM2. 5 and discussed the land area of different concentrations using Kriging interpolation based on the fine particulate matter monitoring data released by Beijing Municipal Environmental Monitoring Center in 2013． Analysis results showed that the city' s annual average PM2. 5 concentration was 89. 5 μg /m3 in 2013 exceeding the national standard( 35 μg /m3 ) 1. 56 times; Seasonal variations concentrations of PM2. 5 were as follows: winter ＞ spring ＞ autumn ＞ summer; PM2. 5 showed significant north-south gradient distribution; the proportion of land area in which average PM2. 5 concentration was below 75 μg /m3 was the largest in Summer with 73% while that was the least in Winter with 22%．