Analysis On Pollution Characteristics Of Ozone In Ambient Air From 2013 To 2015 In Shijiazhuang

In recent years,with the rapid development of urban industrialization and rapid economic growth,the ozone pollution in the air of Shijiazhuang is becoming more and more serious.It has gradually become the atmospheric pollutant after PM₁₀ and PM_2.5.Since January 1,2013,74 cities of the country have formally implemented the environmental air quality standard?GB3095-2012?,except PM₁₀,SO₂,CO,NO₂ of four conventional pollutants,the new standard increased 8 hour ozone?O₃?and fine particles(PM_2.5)concentration limit monitoring index.In order to fully understand the atmospheric environment,the influence of human activities on the atmospheric environment,This paper takes ozone as the main research object,the daily monitoring data from 2013²015in Shijiazhuang city six pollutants and meteorological factors?mean value?,combining with SPSS analysis software,the spatial distribution characteristics,variation of ozone concentration time,to investigate the factors affecting the ozone pollution,to analyze the correlation between meteorological conditions and the time pollutants and ozone.The main conclusions are as follows:1)The concentration of ozone in ambient air from 2013 to 2015 in Shijiazhuang decreased year by year,but little change;ozone pollution happened in late May to early September,the seasonal characteristics of low in summer and high in winter,the average monthly concentration was highest in June,lowest in January,ozone diurnal variation showed a single peak distribution,before sunrise?3:00⁵:00?was the lowest,the highest concentration?15:00¹6:00?afternoon.The characteristics of spatial distribution are clean urban control point,suburban area,high-tech industrial district and urban living area,showing the characteristics of low central city and high suburban area.2)In Shijiazhuang,the ozone concentration in ambient air is greatly affected by meteorological conditions,which ozone was positively correlated with wind speed and temperature and the relative humidity,but the correlation coefficient is negatively correlated with the atmospheric pressure,air temperature.We deduce that atmospheric pressure increase,speed increase,reduce wind,mostly will accelerate the formation of ozone,and the increase of relative humidity effect on the ozone concentration is not very obvious.Nitrogen oxides and volatile organic compounds are precursors of ozone generation,the concentration of O₃ and a CO,NO₂,SO₂ were negatively correlated pollution of PM₁₀ and PM_2.5.When the concentration of CO,NO₂,SO₂ and PM_2.5increases in the atmosphere,the ozone concentration will decrease.The results show that the concentration of O₃ in Shijiazhuang city have little effect by CO,NO₂ precursors and other pollutants,but correlation between nitrogen oxides concentration and ozone concentration is not a simple linear relationship,VOC_S control is the key measures to control the ozone pollution.