Change Of Atmospheric Quality And Its Influencing Factors In Beijing-tianjin-hebei Region

The coordinated development of Beijing,Tianjin and Hebei has become one of the major national strategies.The integration development of Beijing,Tianjin and Hebei should be regulated not only by economic measures,but also by control of environmental protection.However,Beijing,Tianjin and Hebei have become the haze hit areas in China,under the rapid economic development.The analysis of spatial and temporal trend of urban air quality would be helpful to grasp accurately the current situation of urban air quality.In this paper,PM₁₀,SO₂,NO₂ and air pollution index?API?are used to study the atmosphere in Beijing,Tianjin and Hebei regions.The main results are shown as follows:?1?The Spearman model showed that the concentration of pollutants is generally decreasing.The grey relational cluster analysis showed that air quality of2009,2011 and 2015 were high,while air in 2001,2003,2013 and 2014 is seriously polluted.?2?Based on the API data of 2001-2015 years in Beijing,Tianjin,Hebei region,the temporal and spatial variations of air quality are analyzed.The trend of the annual API index showed fluctuation.From 2013 to 2015,the air quality was moderately polluted,but it was improved continuously afterwards.The API indices are the lowest in summer and the highest in winter.?3?The number of days with good air quality from 2013 to 2015 was significantly less than that from 2001 to 2012 by analyzing the changing trend of the air quality,indicating that air quality was polluted from 2013 to 2015.In the 13cities of Beijing,Tianjin and Hebei,the air quality of the coastal cities is better than that of the inland cities.The air quality of the mountain cities is better than that of the plain cities.?4?The correlation between meteorological factors and concentrations of the pollutants showed that temperature and precipitation have great influence on concentrations of pollutants,and and explain the high air quality in summer.?5?The grey cluster correlation analysis of social development factors and pollutant concentrations showed that structural energy consumption has the greatest impact on air quality,followed by scale effect and construction sewage.