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Navalgund, a town in Karnataka, India, sits at coordinates 15.5700°N, 75.3700°E, within the broader Deccan Plateau region. The terrain is generally undulating, characteristic of this plateau landscape, with an elevation that contributes to localized weather patterns. The town’s population of 24,613 reflects a predominantly rural character, though it functions as a regional trading centre for agricultural produce. Navalgund is not directly adjacent to major bodies of water, though smaller streams and tanks are vital for local irrigation. The surrounding landscape is dominated by agricultural fields, primarily cotton and sugarcane, which are key economic drivers. This agricultural intensity has implications for air quality, particularly through the use of fertilizers and potential for crop residue burning. While not a heavily industrialized zone itself, Navalgund’s proximity to larger industrial areas in Karnataka means it can experience transboundary pollution. The urban-rural gradient is pronounced; air quality tends to be better in the immediate rural surroundings, deteriorating closer to the town centre due to vehicular traffic and localized dust. The prevailing winds, influenced by the monsoon systems, play a crucial role in dispersing or concentrating pollutants. Understanding this geographic context is vital for assessing and mitigating air quality challenges in Navalgund.

Navalgund experiences a distinct wet and dry seasonal pattern. The monsoon season, typically from June to October, brings relief from pollution as rainfall washes particulate matter from the atmosphere. However, increased humidity can also foster mold growth, impacting respiratory health. November to February represents the drier, cooler months, often experiencing temperature inversions, trapping pollutants near the ground, particularly from biomass burning for warmth and cooking. This period sees a noticeable increase in particulate matter. March to May are the hottest and driest months, exacerbating dust pollution from agricultural activities and unpaved roads. Strong convective winds can offer temporary relief, but overall, this is a period of poorer air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. The post-monsoon period (October-November) can see a spike in pollutants due to crop residue burning after the harvest. Fog, common during the cooler months, further reduces visibility and concentrates pollutants. Monitoring wind patterns and avoiding peak agricultural burning times are crucial for protecting public health.