Variation of Atmospheric Boundary Layer Height and Application of Forward Selection Technique during Diwali

During the Diwali festival in the Delhi region, the Atmospheric Boundary Layer (ABL) height is examined in relation to pollution (caused by firecrackers) and climatic conditions. Air quality, ABL height, and Ventilation Coefficient (VC) have all been studied over the past four years as a result of firecracker use. By employing a forward selection technique, we have determined the most important factors that influence the ABL's height. The primary goal of this study is to discover the air pollution parameter that has the greatest impact on the ABL height. SOund Detection And Ranging (SODAR) has become a key tool for the continuous monitoring of ABL height. On Diwali in 2014–2017, the daily average ABL height was 300, 660, 308, and 263 m, respectively. These year's heights were about 25, 15, and 6% lower than the comparable Pre-Diwali days in 2014, 2016, and 2017, respectively; nevertheless, they were 15% higher in 2015. Mean comparisons and correlations show that the burning of firecrackers on Diwali contributes significantly to the amount of particulate matter and gaseous pollutants in the atmosphere. Using a forward selection strategy to choose the most influential parameters, the strongest correlations between meteorological variables and pollution concentrations were found. Temperature, relative humidity, wind speed, NO2, and SO2 input variables were selected based on their importance in 2014–2017 using a forward selection technique.