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Nallūr, a small town in Karnataka, India, sits at coordinates 14.0871°N, 75.8778°E, nestled within the undulating terrain of the Western Ghats foothills. With a population of approximately 11,617, Nallūr’s geography significantly influences its air quality. The town is situated in a predominantly agricultural region, characterized by rice paddies and coconut plantations, with pockets of areca nut cultivation. This agrarian landscape, while providing a rural buffer, also contributes to seasonal biomass burning, particularly after harvests. The surrounding landscape is a mix of gently sloping hills and plains, influencing local wind patterns. Nallūr isn’t directly adjacent to major industrial belts, but regional industrial activity in nearby Hubballi-Dharwad can contribute to long-range pollutant transport. The urban-rural gradient is relatively sharp; Nallūr itself is a compact settlement, quickly transitioning to agricultural land. Elevation plays a role, with the town situated at approximately 650 meters above sea level, affecting atmospheric mixing. Proximity to the Arabian Sea, while not immediate, introduces moisture and influences monsoon patterns. The local terrain can trap pollutants during calm weather conditions, exacerbating air quality issues. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Nallūr.

Nallūr experiences a distinct wet and dry season, heavily influenced by the Indian monsoon. Air quality generally improves during the monsoon months (June-October) as rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also foster mold growth, impacting respiratory health. The post-monsoon period (November-December) sees a gradual deterioration in air quality as temperatures drop and wind speeds decrease, leading to temperature inversions that trap pollutants near the ground. This is often accompanied by increased burning of agricultural residue. The dry season (January-May) presents the most challenging air quality conditions. High temperatures and low humidity contribute to dust suspension, while agricultural practices like harvesting and land preparation lead to increased biomass burning. February and March are typically the worst months for air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these periods. Fog can also occur during cooler mornings, exacerbating particulate matter concentrations. Monitoring wind direction is vital, as pollutants from regional sources can be carried into Nallūr during specific weather patterns.