Variation Characteristics of Air Pollutants in Urban Area of Beijing before, during and after 2014 Meeting of APEC
LU Shaowei
JIANG Yan
ZHAO Yunge
LI Shaoning
CHEN Bo
Abstract：In purpose of probing into the spatial-temporal distribution,interrelationships of air pollutants before,after and during the meeting of APEC,which was held in Beijing in the middle of November,2014,air quality monitoring stations in Beijing,a total of twelve among others,were selected to investigate the effects of temporary mitigation measures carried out during the period of APEC on the air quality.The investigation showed that concentrations of the air pollutants except O3 during the APEC were lower than those before and after the period of APEC,the diumal variation of pollutants concentrations was the mildest (α=0.05,Sig＞0.05),and the daily variation tended to "M" type,pollutants concentrations gradually increasing from north to south and from west to east,furthermore,the reverse coupling degree of spatial variation of O3 against NO2 was the highest (p=0.01,r＜-0.80).In addition,concentrations of PM2.5,SO2,NO2and CO were positively correlated with one another in different levels during the different periods but for O3 that was negatively correlated with others.The investigation also suggested that the concentration of air pollutants was mainly influenced by the pollution sources,regional pollutants transport,meteorological factors and the correlationship of the pollutants,etc.and by regression analysis it was found that temperature was negatively corrected with concentrations of SO2,NO2 and CO notably(α=0.05,Sig＜0.05) while concentrations of NO2,CO,and PM2.5 were very much positively correlated with air humidity (α=0.05,Sig=0.00＜0.05).Furthermore,it was found that PM2.5 was a primary pollutant,but its concentration dropped off due to the combined effects of a variety of factors,which made the air quality attain fairy good during the APEC period.In conclusion,measures of energy conservation and emissions reduction taken during the meeting of APEC resulted in good environmental benefits,and the experience could be an example for the environmental administration departments to take a reasonable and effective measure.
Keywords：during the meeting of APECair pollutantsspacio-temporal variation characteristicsinfluencing factors
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 40-47 )