Shaping Air Negative Ion Life Circles in the Coastal Space for Healthy Cities

Air quality is an important factor affecting human health. Air negative ions are one of the elements of the air, with functions such as health care and air purification. As one of the important indicators of urban air quality, its impact on public health is profound. Firstly, the coastal area of Dalian, China is selected as the research object. Based on the division of land functional units, combined with spatial layout, building density, green space and other factors, the measured sampling points of each unit are determined, and the air ion concentration is actually monitored. The monitored data is used to analyze the temporal and spatial distribution characteristics of air negative ions, and use ArcGis interpolation to analyze their distribution laws. At the same time, according to the corresponding evaluation standards, the level of air quality in the area is obtained. Secondly, the correlation analysis between air negative ions and microclimates such as temperature, humidity, wind speed, etc., based on the correlation significance, draws a conclusion that wind speed has a greater impact on air negative ions. Based on the correlation significance, it is determined that wind speed has a greater impact on air negative ions. Use phonics (one of the Computational Fluid Dynamics analysis software) to simulate wind environment, and compare the simulation results with the distribution of air negative ions, spatial layout, and clusters of people. The superposition and comparative analysis can then intuitively find the built-up space elements that affect the distribution of negative air ions, which provides a direction for the optimization of the coastal area. Finally, combined with public health needs, summarized the coastal area space optimization strategy, using water system and green space as the organizational function, constructing high negative ion living units, and combining the prevailing wind direction, opening the "wind-negative ion" channel, etc., to create a rich and fresh air , Healthy and comfortable space environment.