| Objectives:Analyze the characteristics of air pollutants in major cities in Liaoning Province from 2014 to 2018,and understand the air quality status of Liaoning Province in recent years;Analyze the correlation of air pollutants between major cities and the correlation between particulate matter and gaseous pollutants in each city;Taking the provincial capital of Shenyang as an example,using PMF model software to perform source analysis on the components of fine particulate matter(PM2.5),identify the major pollution sources of polycyclic aromatic hydrocarbons（PAHs）,heavy metal elements,and water-soluble ions in PM2.5 and their contribution to environmental pollution,so as to comprehensively understand the current status,changes and pollution sources of air pollution in major cities in Liaoning Province,provide reasonable scientific basis for formulating countermeasures for air pollution prevention.Method:Collect the daily average concentrations of six air pollutants(PM2.5,PM10,SO2,NO2,CO,and O3)and daily air quality index（AQI）data in major cities in Liaoning Province from 2014 to 2018 for collation.Excel 2010 was used for data collation,chart production,and correlation analysis of pollutants.SPSS24.0 was used for analyzing the differences of AQI,air pollutants and PM2.5 components.Source analysis of PM2.5components in Shenyang was performed using PMF5.0 model.Results:1.From 2014 to 2018,the annual average values of AQI in major cities in Liaoning Province showed a year-on-year downward trend;the monthly average AQI concentration of each city in the year was U-shaped,and the seasonal distribution characteristics were high in winter and low in summer.Dalian,Dandong and other coastal areas urban air quality were good,while inland cities such as Shenyang and Anshan were more polluted.2.The concentrations of PM2.5,PM10,SO2,NO2 and CO in major cities of Liaoning Province had been decreasing year by year from 2014 to 2018.The monthly concentrations of PM2.5,PM10,SO2,NO2 and CO in 10 cities had shown a U-shaped curve Characteristics,and the seasonal distribution characteristics were obvious,showing the characteristics of high winter and low summer.But O3 concentration showed an upward trend year by year,the monthly concentration showed a"U-shaped"curve change characteristics,seasonal distribution characteristics showed the characteristics of low winter and high summer.3.From 2014 to 2018,six air pollutants in different cities were highly correlated,and particulate matter(PM2.5 and PM10)in the same city were significantly correlated with gaseous pollutants（SO2,NO2,CO,and O3）.4.Taking Shenyang,the provincial capital as an example,the sources of PM2.5 PAHs from 2014 to 2018 were motor vehicle exhaust sources（37.4%）;coal combustion sources（32%）,petroleum volatilization leak sources（16.7%）,and industrial emission sources（13.8%）.Sources of heavy metal elements and water-soluble ions were secondary sources（31.7%）,dust sources（26.1%）,coal-fired sources（24.9%）,and industrial emission sources（17.3%）.Conclusion:1.From 2014 to 2018,the concentrations of AQI,PM2.5,PM10,SO2,NO2,and CO in major cities in Liaoning Province showed a downward trend,while O3 showed an upward trend.2.There was a high correlation between pollutants in different cities in Liaoning Province,and a significant correlation between particulate matter and gaseous pollutants in the same city.3.The main sources of PAHs in the PM2.5 component of Shenyang were motor vehicle exhaust sources and coal burning sources,and the main sources of heavy metal elements and water-soluble ions were secondary sources and dust sources.In summary,in recent years,air quality in Liaoning Province had improved and air pollution control had achieved certain results.However,it was still necessary to strengthen control of air pollutant emissions.Due to the mutual influence of air pollutants in adjacent areas,the province’s concerted action was required to jointly control air pollution. |
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