With the improvement of urbanization, the temperature of the city also changes, and the urban heat island is most closely related to the temperature change. The surface temperature in the center is higher than that in the suburbs, causing the atmosphere to rise and form a low-pressure vortex, which is not conducive to the discharge of pollutants and waste heat from exhaust gas, and will cause harm to the physical and mental health of residents over time. The purpose of this paper is the effect and urban air pollution diffusion. In the experiment, the large eddy is used to simulate the diffusion of two typical urban pollution sources. The diffusion of fixed sources and their impact on ground are affected by the atmosphere. During the day, when there is a movement in it, the pollutants from fixed sources are easier to reach the ground.

Eldridge Daniel. Large Eddy Simulation Study of Urban Heat Island Effect and Urban Air Pollution Diffusion. Academic Journal of Environmental Biology (2021), Vol. 2, Issue 3: 10-18. https://doi.org/10.38007/AJEB.2021.020302.

[1] Atik N, Tsuyoshi H. Analysis of Land Use Change and Expansion of Surface Urban Heat Island in Bogor City by Remote Sensing. International Journal of Geo-Information, 2018, 7(5):165-165. https://doi.org/10.3390/ijgi7050165

[2] Budhiraja B, Gawuc L, Agrawal G. Seasonality of Surface Urban Heat Island in Delhi City Region Measured by Local Climate Zones and Conventional Indicators. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2019, 12(12):5223-5232.

[3] Ihadua I, Filho A. On Thunderstorm Microphysics under Urban Heat Island, Sea Breeze, and Cold Front Effects in the Metropolitan Area of So Paulo, Brazil. Atmospheric and Climate Sciences, 2021, 11(3):614-643. https://doi.org/10.4236/acs.2021.113037

[4] Polydoros A, Mavrakou T, Cartalis C. Quantifying the Trends in Land Surface Temperature and Surface Urban Heat Island Intensity in Mediterranean Cities in View of Smart Urbanization. Urban Science, 2018, 2(1):16-16. https://doi.org/10.3390/urbansci2010016

[5] Kim S W, Brown R D. Urban heat island (UHI) intensity and magnitude estimations: A systematic literature review. Science of the Total Environment, 2021, 779(1):146389-146389.

[6] Wang Y, Du H, Xu Y, et al. Temporal and spatial variation relationship and influence factors on surface urban heat island and ozone pollution in the Yangtze River Delta, China. Science of the Total Environment, 2018, 631(8):921-933.

[7] Santos L, Afshari A, Norford L K, et al. Evaluating approaches for district-wide energy model calibration considering the Urban Heat Island effect. Applied Energy -Barking Then Oxford-, 2018, 215(4):31-40.

[8] Dwivedi A, Khire M V. Application of split- window algorithm to study Urban Heat Island effect in Mumbai through land surface temperature approach. Sustainable Cities and Society, 2018, 41(1):865-877. https://doi.org/10.1016/j.scs.2018.02.030

[9] Firozjaei M K, Kiavarz M, Alavipanah S K, et al. Monitoring and forecasting heat island intensity through multi-temporal image analysis and cellular automata-Markov chain modelling: A case of Babol city, Iran. Ecological Indicators, 2018, 91(8):155-170.

[10] Li X, Stringer L C, Dallimer M. The Spatial and Temporal Characteristics of Urban Heat Island Intensity: Implications for East Africa Urban Development. Climate, 2021, 9(4):51-51. https://doi.org/10.3390/cli9040051

[11] Byon J Y, Hong S O, Park Y S, et al. Evaluation of the Urban Heat Island Intensity in Seoul Predicted from KMA Local Analysis and Prediction System. Journal of the Korean earth science society, 2021, 42(2):135-148.

[12] Romano P, Prataviera E, Carnieletto L, et al. Assessment of the Urban Heat Island Impact on Building Energy Performance at District Level with the EUReCA Platform. Climate, 2021, 9(3):48-48. https://doi.org/10.3390/cli9030048

[13] Hidayat D J, Soekirno S. Development of temperature monitoring and prediction system for urban heat island (UHI) based on the internet of things. Journal of Physics Conference Series, 2021, 1816(1):012054.

[14] Awuh M E, Japhets P O, Enete I C. Geospatial Techniques, a Superlative Method to Assess Urban Heat Island Intensity: The Case of Abuja Municipal, Nigeria. Journal of Geographic Information System, 2021, 13(1):52-64. https://doi.org/10.4236/jgis.2021.131004

[15] Schweighofer J, Wehrl M, Baumgrtel S, et al. Calculating Energy and Its Spatial Distribution for a Subsurface Urban Heat Island Using a GIS-Approach. Geosciences (Switzerland), 2021, 11(1):24-24.

[16] Wiszniowski J. Healthy city versus the urban heat island effect in the context of global warming. Passive and active methods reduction of UHI. BUILDER, 2021, 284(3):29-31.

[17] Narumi D, Levinson R, Shimoda Y. Effect of Urban Heat Island and Global Warming Countermeasures on Heat Release and Carbon Dioxide Emissions from a Detached House. Atmosphere, 2021, 12(5):572-572. https://doi.org/10.3390/atmos12050572

[18] Santos L, Nevat I, Pignatta G, et al. Climate-informed decision-making for urban design: Assessing the impact of urban morphology on urban heat island. Urban Climate, 2021, 36(3):100776-100776.

[19] Chidi C L, Magar R, Magar D S. Assessment of urban heat island in Kathmandu valley (1999-2017). Geographical Journal of Nepal, 2021, 14(1):1-20. https://doi.org/10.3126/gjn.v14i0.35544