Preliminary Analysis of Influencing Factors of Low Visibility on a Hazy Day in Winter in Binzhou City

摘要

Based on the monitoring data of visibility,particulate matter( PM_(2. 5) and PM_(10)) and atmospheric pollutants( SO_2,NO_2,CO,and O_3),and meteorological factors( temperature,humidity,and wind speed) at the six automatic air monitoring stations in Binzhou City from December 2016 to February 2017,the correlations between visibility and influencing factors were analyzed to study the main influencing factors of atmospheric visibility. The results showed that the daily average concentration of particulate matter negatively correlated with atmospheric visibility,and the correlation between PM_(2. 5) concentration and atmospheric visibility was more obvious than that of PM_(10) concentration. Among atmospheric pollutants,the daily average concentration of CO,NO_2 and SO_2 also negatively correlated with atmospheric visibility,while there was a positive correlation between visibility and the daily average concentration of O_3. Daily average temperature and wind speed positively correlated with visibility,while relative humidity negatively correlated with visibility. Wind speed,relative humidity and PM_(2. 5) had strong correlation with visibility,and the linear correlation coefficient R2 was 0. 501 6,0. 446 6,and 0. 205 8 respectively,so wind speed,relative humidity,and PM_(2. 5) were the main factors influencing the decrease of atmospheric visibility on a hazy day in winter.