The impact of urbanization on air quality is expected to vary based on how meteorology and the complex atmospheric chemistry would respond to prominent changes in land use land cover (LULC) taking place over several decades. The present study examines the aerodynamic impacts of an increase in the urban sprawls across the central National Capital Region, encompassing about 12,540 km² area of India over fifty years for representative years 1972, 1981, 1993, 2003 and 2014 using WRF-Chem with equal emission inventories for each year. Subsequent to model validation for the study area, various air quality parameters are analyzed in the context of model prediction and increasing urban sprawls. Surface values and their spatial variations and vertical profiles during day and night are examined decade-wise and cumulatively over half a century for various pollutant species. In the various decades, where considerable area got urbanized, the model simulated a decrease of surface SO₂ and PM₁₀ values of about 20% and 40%, respectively, during both, night and daytime. In contrast, the O₃ surface values show an increase of about 40% and 10% during night time and daytime, respectively. At higher levels, a significant increase in O₃ and PM₁₀ values is observed attributed to redistribution from changing wind speed and temperature pattern, which alters atmospheric mixing and the boundary layer. It is inferred that the aerodynamic impacts of urban sprawls influences the dispersal behavior of pollutants and requires further in-depth studies.

预计城市化对空气质量的影响将根据气象学和复杂的大气化学如何响应几十年来发生的土地利用土地覆盖（LULC）的显着变化而变化。本研究考察了整个国家首都中部地区约12540 km ²的城市扩张对空气动力的影响。使用WRF-Chem（每年具有相等的排放量清单），代表印度1972年，1981年，1993年，2003年和2014年的50年。在对研究区域进行模型验证之后，在模型预测和城市蔓延加剧的背景下分析了各种空气质量参数。十年来对各种污染物种类的表面值及其空间变化和白天和黑夜的垂直剖面进行了十年一次的检查，并在半个世纪内对其进行了累积检查。在数十年的城市化进程中，该模型模拟了夜间和白天的表面SO ₂和PM ₁₀值分别下降了约20％和40％。相反，O ₃表面值在夜间和白天分别增加了约40％和10％。在较高水平，观察到O ₃和PM ₁₀值显着增加，这归因于风速和温度模式的变化引起的重新分布，从而改变了大气混合和边界层。据推测，城市蔓延的空气动力学影响影响污染物的扩散行为，需要进一步深入研究。