Research On Variation Trends And Space Difference Based On AQI Of Beijing-Tianjin-Hebei Urban Agglomeration

Beijing-Tianjin-Hebei urban agglomeration plays a leading role in the process of China's economic development of three urban agglomeration.Meanwhile,extensive economic development has led to the most serious air pollution.Regional characteristic and composite type of air pollution bring huge challenge to the development of Beijing-Tianjin-Hebei urban agglomeration.Special research on regional environment pollution characteristics,variation pattern and influence mechanism has important practical significance and policy value in the integration and sustainable development of Beijing-Tianjin-Hebei urban agglomeration.Recent related literature was systematically reviewed firstly.Then,based on the daily data of air quality index(AQI)of Beijing-Tianjin-Hebei urban agglomeration,chapter 2 studies on variation trends and laws of AQI in Beijing-Tianjin-Hebei urban agglomeration.On the one hand,doing research on the ranking of thirteen cities of Beijing-Tianjin-Hebei urban agglomeration's AQI,and make compare with the Yangtze River Delta urban agglomeration?Pearl River Delta urban agglomeration and seventy-four key cities in China.On the other hand,doing research on distribution and variation laws of the key cities in Beijing-Tianjin-Hebei urban agglomeration--Beijing Tianjin and Shijiazhuang.Considering the key influence of season,chapter 3 shows research on the seasonal variation pattern of Beijing-Tianjin-Hebei urban agglomeration firstly.Afterwards make compare towards AQI of inside cities in Beijing-Tianjin-Hebei urban agglomeration to reveal the difference and connection towards space.In chapter 4,building measurement model to analyze the influence factors of air quality index using Beijing?Tianjin and Shijiazhuang as example.Chapter 5 summarize the research,draw basic conclusion and give suggestions.The research find:(1)During the observation period,the air quality of Beijing-Tianjin-Hebei urban agglomeration make progress in recent years.But there is still large gap between Beijing-Tianjin-Hebei urban agglomeration and Yangtze River Delta urban agglomeration?Pearl River Delta urban agglomeration.(2)The air quality index of Beijing-Tianjin-Hebei urban agglomeration shows clear seasonal variation pattern.The long-term trend of air quality has improved but still exists fluctuation on each stage;(3)There exists differences between North and South of Beijing-Tianjin-Hebei urban agglomeration.(4)Based on the research of influence towards air quality index,find that there exists significant correlation between air quality index and visibility?air temperature?wind speed?humidity?air pressure and other factors,and there exists difference between different places.