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Nelliyalam, nestled in the Erode district of Tamil Nadu, India (11.5255° N, 76.3589° E), occupies a geographically significant position within the Kaveri Delta region. The town’s terrain is predominantly flat, characteristic of the fertile alluvial plains formed by the Kaveri River and its tributaries. This flat landscape, while conducive to agriculture, presents challenges regarding air quality dispersion, particularly during periods of stagnant atmospheric conditions. Situated approximately 450km southwest of Chennai, Nelliyalam benefits from the region’s generally warm and humid climate. The surrounding landscape is a mosaic of agricultural fields – predominantly rice paddies and sugarcane plantations – interspersed with smaller villages and pockets of dry scrubland. The proximity to the Bhavani River, though providing a vital water source, can also contribute to localized humidity and fog formation, impacting pollutant visibility and potentially trapping emissions. The urban–rural gradient around Nelliyalam is gradual; the town itself is relatively small, exhibiting a primarily rural character with limited industrial development. However, its location within the Erode district, a known textile and agricultural processing hub, means it is indirectly influenced by industrial activity further afield. The lack of significant elevation changes hinders vertical mixing of pollutants, and the prevailing wind patterns, often influenced by the monsoon seasons, dictate the primary direction of pollutant transport. The flat topography and agricultural intensity combine to create a setting where agricultural burning, a common practice during harvest seasons, can significantly impact local air quality.

Nelliyalam’s tropical climate dictates a distinct wet and dry seasonal pattern, profoundly influencing its air quality. The southwest monsoon (June to September) brings substantial rainfall, generally leading to improved air quality as pollutants are washed out of the atmosphere. However, the monsoon also introduces moisture, which can exacerbate the effects of particulate matter, particularly during periods of reduced wind speed. The post-monsoon season (October-November) often sees a rise in air pollution due to agricultural burning as farmers clear fields for the next planting season. This practice releases significant quantities of smoke, soot, and other harmful pollutants. The dry season (December to May) is typically characterized by higher temperatures and lower humidity, which can lead to temperature inversions, especially during the early morning hours. These inversions trap pollutants near the ground, resulting in elevated concentrations. Fog, common during the cooler months (December-February), further restricts dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and dry seasons, particularly during periods of agricultural burning or fog. Outdoor activities are generally best avoided during the early morning hours in winter due to potential temperature inversions. The monsoon months offer a respite, but even then, awareness of potential particulate matter impacts is advisable. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, especially during periods of elevated pollution.