Analysis Of Spatial-Temporal Characteristics On Atmospheric Pollution And Evaluation Of Air Quality In The Main Urban Area Of Fuzhou

In recent years,the situation of urban air quality is becoming more and more serious,the problem of air pollution has been paid attention continuously.Perennial air quality of Fuzhou is good,but the atmospheric environment pressure in the course of development of the main urban area is also worthy of attention,therefore,it is of great practical significance to analyze the spatial-temporal characteristics of air pollution and evaluate atmospheric environmental quality in the main urban area of Fuzhou.The main research results are as follows:(1)PM10 was the major air pollutant w highest occurence frequency in the main urban area of Fuzhou in 2015,and the pollution level of CO and SO2 was very low,the average monthly and daily concentrations reached the national air quality standard.The seasonal variation of pollutant concentration was U-shaped,which was higher in winter and spring than in summer and autumn,and the concentrations of NO2,SO2,PM2.5 and PM10 reached the peak value in January.The concentration of pollutants did not have a significant weekend effect,but fluctuated within 24 hours,with the exception of O3,the concentrations of other pollutants were highest about 10:00.Fluctuated obviously of pollutant concentration did not appear during the the first National Youth Games,the particles PM2.5 and PM10 were the main pollutants.From the point of meteorological factors influencing pollutant concentration,when the winds reach gale after grade,reducing rate of the pollutant concentration increases quickly.(2)The study on the spatial variability of air pollutant concentration in the study area has been realized by adding the simulation site,and the accuracy of spatial interpolation analysis has been improved effectively.For the regional variability of the atmospheric pollutant concentration,high concentration areas of particles PM2.5 and PM10 concentrated in the center of the city zone and suburb of Taijiang district from administrative division of view,the pollution level was relatively high in Taijiang district,and the higher concentration of 03 mainly concentrated in Jinan district in the high altitude forest region.CO,SO2 and NO2 were similar to particles,high concentration of regional distribution in the main city center,was affected mainly by automobile exhaust.From the point of view of environmental function zone,O3 showed regional variation characteristics different from other pollutants,high concentration areas were mainly concentrated in natural resources optimization area,and other pollutants are concentrated in environmental optimization and selfcare area.(3)Comparison of air quality evaluation in Fuzhou main urban area by AQI index method and BP artificial neural network,the result of evaluation was slightly different due to the principle of two evaluation methods were different,but generally similar,In 2015,the air quality in the main urban area of Fuzhou was mainly based on the first grade,and the air quality in the second half was better than that in the first half of the year,of which was worst in January,and the best air quality was in August and September.The main pollutants were NO2,O3,PM2.5 and PM10,and the frequency of PM10 was much higher than that of other primary pollutants.