| In recent years,social from all walks of life pay more attention to atmospheric environment because frequent fog weather.PM2.5 is acknowledged as the culprit of haze.All levels of government set tighter goals to control it.Tangshan is an important industrial city.PM2.5 pollution of Tangshan is relatively serious.Therefore it is necessary to study of the characteristics and source of Tangshan's PM2.5.This study analyzed in a more comprehensive system about heating period air pollution of Tangshan in 2017 from meteorological conditions,conventional pollutants,PM2.5 chemical composition,PH,air transport and the resolution of source applied online observation data.Trough the comparing of PM2.5 chemical composition from heating period in 2016 and 2017and in 2017 before heating period.Discuss the change of the atmospheric pollution situation of Tangshan heating period in 2017 compared with 2016 heating period and 2017 before heating period.And the change of the atmospheric pollution situation of Tangshan heating period in 2017and in 2017 before heating period.The main conclusions are as follows:PM2.5 mass concentration averages is 61.6 ug/m3 in Tangshan during heating period in 2017,air pollution is light relatively.The concentration average of PM10,SO2,NO2 and O3 were 99.9,59.6,63.3,20.7 ug/m3 respectively.Meteorological aspects is mainly influenced by west north wind,the average wind speed is 1.6 m/s,average atmospheric relative humidity is 41.5%.The concentration average of OC,NH4+,NO3-,SO42-is higher in PM2.5,were 15,29,12.25,10.16,8.11 ug/m3,respectively.The sum of four account for 77.55%of the sum of the mass concentration of monitoring component.Element content is low in PM2.5.Pearson correlation coefficient is 0.95 of OC and EC in PM2.5.The correlation is extremely strong.OC and EC main commonly come from emissions of fuel combustion.OC is less affected by the quadratic transformation.Tangshan is mainly effected by burning coal and biomass of mixed source,secondary source,road dust,industrial sources and motor vehicle exhaust gas source during heating period in 2017,the contribution ratio were 34.4%,31.2%,12.2%,11.2%,10.9%,respectively.Compare fine mild and moderately severe pollution during heating period observation in Tangshan in 2017.With the increase of pollution degree,the ratio of mass concentration NO2/SO2.the value of SOR?NOR are increasing.By the process of air quality fine to pollution,the ratio of mass concentration NO3-/SO4-increase significantly with OC/EC drop significantly.Combined with the source analytical results show that,coal and biomass mixing source accounted for the highest(41.9%)in air quality fine during heating period observation in Tangshan in 2017.As the degree of pollution.the mixed coal and biomass sources,roads and buildings of dust source decreased greatly in pollutants,the second transformation of SO2?NOx?to SO42-?NO3-enhanced significantly.the proportion of secondary source and motor vehicle emissions increase significantly in pollutants.The ratio of secondary sources arrive highest(44.0%)when moderately severe pollution.The decrease of the wind speed,the increases of the air relative humidity.the influence of the regional transport have promoting effect on the development of pollution in Tangshan.Trough the comparing of pollution from heating period in 2016 and 2017and in 2017 before heating period.We can find atmospheric PM2.5 pollution lighter significantly in 2017,SO42-drop significantly.In addition to the good air mass transfer meteorological conditions during heating period in 2017,strict environmental protection policies in heating period.measures such as to ban small coal-fired boiler are more important reason.The ratio of cationic and anionic equivalent concentration increasing gradually in Tangshan,the reason may be pollution reduce,So42-,NO3-generated decrease. |
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