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Devanhalli, situated in Karnataka, India (13.2300°N, 77.7000°E), occupies a unique geographic position on the Deccan Plateau. The town’s elevation, approximately 910 meters above sea level, contributes to a relatively moderate climate, though it also influences pollutant dispersion. Historically a small agricultural settlement, Devanhalli has experienced rapid urbanisation driven by its proximity to Kempegowda International Airport, Bengaluru. This growth has dramatically altered the urban-rural gradient, replacing farmland with residential and commercial developments. The surrounding landscape is characterised by rocky terrain, interspersed with agricultural fields cultivating crops like ragi, maize, and pulses. While no major rivers flow *through* Devanhalli, it lies within the Arkavathy river basin, and groundwater is a crucial resource. The increasing industrial activity associated with the airport and supporting logistics hubs, concentrated along the Bellary Road corridor, is a significant factor impacting local air quality. Dust from construction, vehicle emissions, and potential industrial effluents contribute to particulate matter and gaseous pollutants. The relatively flat terrain offers limited natural barriers to wind flow, meaning pollutants can accumulate during periods of low wind speed and temperature inversions, particularly in the pre-monsoon season. Understanding this interplay between geography, urban development, and industrial activity is crucial for effective air quality management in Devanhalli.

Devanhalli experiences a tropical savanna climate, with distinct wet and dry seasons dictating air quality patterns. The post-monsoon period (October-November) often sees a temporary improvement in air quality as rainfall washes away accumulated pollutants. However, this is short-lived. The dry season (December-May) brings consistently poorer air quality. Lower humidity and stagnant air masses allow pollutants from vehicle exhaust, construction dust, and local industries to concentrate. January and February are typically the worst months, with temperature inversions trapping pollutants near the ground. The pre-monsoon season (March-May) is characterised by strong winds that can stir up dust, exacerbating particulate matter levels. The southwest monsoon (June-September) provides significant relief, with heavy rainfall effectively cleansing the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in January-February and March-May. During the monsoon, while air is cleaner, the risk of waterborne diseases increases, requiring caution. Monitoring wind patterns and proactively managing dust from construction sites are vital for mitigating pollution throughout the year.