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Somavārappatti, nestled in the Dharmapuri district of Tamil Nadu, India (10.6779° N, 77.2131° E), occupies a geographically significant position within the broader Kaveri River basin. The village sits on a gently undulating terrain, characteristic of the Deccan Plateau, with elevations ranging from approximately 300 to 450 meters above sea level. This plateau landscape influences regional air circulation patterns, often leading to stagnant conditions during certain periods. The surrounding landscape is predominantly rural, a mosaic of agricultural fields cultivating crops like paddy, ragi, and groundnut, interspersed with dry deciduous forests. The Kaveri River, though not immediately adjacent, exerts a regional climatic influence, moderating temperatures and contributing to localized humidity. Somavārappatti’s proximity to the Hogenakkal Falls, a major tourist destination, introduces potential sources of particulate matter from vehicle traffic and visitor activity, though the impact is likely localized. The urban–rural gradient is gradual; the village is surrounded by smaller agricultural settlements, with Dharmapuri city, a larger urban center, lying approximately 25 kilometers to the north. Industrial activity in the region is relatively limited, primarily focused on small-scale agricultural processing and stone quarries, which can contribute to localized dust pollution. The prevailing winds, generally southwesterly, carry air masses from the Western Ghats, potentially introducing moisture and pollutants from further afield, though the impact is diluted by the distance. Topography contributes to localized air stagnation, particularly during periods of calm weather, exacerbating any existing pollution sources.

Somavārappatti experiences a tropical wet-dry climate, significantly impacting its air quality throughout the year. The monsoon season, typically from June to September, brings relief from accumulated pollutants as heavy rainfall effectively washes particulate matter from the atmosphere. However, the onset of the monsoon can initially see a surge in humidity, which can trap pollutants closer to the ground. The post-monsoon period (October-November) often sees improved air quality as winds become more consistent, dispersing any lingering pollutants. The dry season (December-May) presents the greatest air quality challenges. Reduced rainfall, coupled with increased temperatures, leads to higher levels of dust and particulate matter, particularly from agricultural activities like harvesting and land preparation. Temperature inversions, common during the cooler months (December-February), trap pollutants near the ground, worsening air quality. Fog, frequently occurring in the early morning during this period, further restricts atmospheric mixing and concentrates pollutants. March and April, with their high temperatures and dry winds, often witness the peak in air pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these months, particularly during the early morning hours when fog is prevalent. Agricultural workers are at particular risk and should utilize appropriate respiratory protection. During the monsoon months, while overall air quality improves, those with allergies may experience increased discomfort due to high humidity and pollen levels. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, especially during the dry season.