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Emmiganūru, a small town in Karnataka, India, rests at coordinates 15.1500°N, 76.9200°E, situated within the undulating terrain of the Western Ghats foothills. With a population of approximately 12,720, the town’s geography significantly influences its air quality. The surrounding landscape is predominantly agricultural, characterized by rice paddies and coconut plantations, interspersed with patches of deciduous forest. Emmiganūru’s elevation, though not dramatically high, contributes to localized temperature inversions, trapping pollutants during calmer weather. The town isn’t directly adjacent to major bodies of water, though smaller streams and irrigation canals are present, impacting local humidity and dust suspension. While not a major industrial hub itself, Emmiganūru lies within reach of larger industrial areas in nearby districts, contributing to regional background pollution. The urban-rural gradient is quite sharp; the town centre is relatively compact, quickly transitioning to agricultural land. This proximity to agricultural practices introduces seasonal biomass burning, a key factor in air quality fluctuations. Road dust from unpaved roads and vehicle emissions within the town also contribute to particulate matter concentrations. The prevailing winds, influenced by the monsoon patterns and the Western Ghats, play a crucial role in dispersing or concentrating pollutants.

Emmiganūru experiences a distinct wet and dry season, heavily influencing air quality. The dry season, roughly November to May, sees the poorest air quality. Lower humidity and stagnant air allow pollutants from vehicle exhaust, road dust, and agricultural burning to accumulate. January and February are typically the worst months, with temperature inversions frequently trapping pollutants near ground level. The pre-monsoon months of April and May bring increased dust storms, exacerbating particulate matter levels. The arrival of the Southwest Monsoon in June brings a dramatic improvement. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, increased cloud cover can also lead to reduced sunlight, potentially increasing ground-level ozone formation. September and October, as the monsoon recedes, see a gradual deterioration in air quality as the atmosphere stabilizes. Fog formation during cooler mornings in these months can trap pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly January-May. Wearing masks and avoiding peak traffic hours are recommended. During the monsoon, while air is cleaner, mould growth indoors can pose a health risk.