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Hullatti, nestled in the Dharmapuri district of Tamil Nadu, India (11.4771° N, 76.6960° E), occupies a geographically significant position within the broader Kaveri River basin. The town’s terrain is gently undulating, characterized by rocky outcrops and pockets of fertile agricultural land, typical of the Deccan Plateau’s transition zone. Situated approximately 200 meters above sea level, Hullatti experiences a relatively moderate elevation, influencing local weather patterns and air circulation. The surrounding landscape is predominantly rural, a mosaic of dry deciduous forests, interspersed with cultivated fields of paddy, sugarcane, and pulses. This agricultural activity, while vital to the local economy, contributes to seasonal particulate matter. Hullatti’s proximity to the Kaveri River, though not directly adjacent, provides a degree of moisture and influences regional wind patterns. Further afield, the industrial belt centered around Salem, roughly 80 kilometers to the north, represents a potential source of transboundary air pollution, particularly during periods of stagnant air. The urban–rural gradient around Hullatti is gradual; the town itself is small, with a population of just over 12,000, and blends seamlessly into the surrounding agricultural landscape. This limited urban sprawl generally reduces localized pollution compared to larger metropolitan areas, but the reliance on biomass for cooking and heating in surrounding villages can contribute to localized smoke events. The prevailing winds, generally southwesterly, carry moisture from the Arabian Sea, but also potentially pollutants from industrial areas to the north.

Hullatti’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting air quality. The dry season, typically spanning from March to May, is characterized by high temperatures and low humidity, often leading to stagnant air conditions. This period frequently witnesses elevated levels of particulate matter, stemming from agricultural burning practices as farmers clear fields for the next planting season. Temperature inversions, common during these months, trap pollutants near the ground, exacerbating the situation. The monsoon season, from June to September, brings relief with increased rainfall, effectively scrubbing the atmosphere and significantly reducing pollution. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation. October and November represent a transitional period, with decreasing rainfall and gradually increasing temperatures, potentially leading to a resurgence of particulate matter. Fog, common during the cooler months (December-February), can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods. Outdoor activities are generally more favorable during the monsoon months and the cooler, drier period of December-February, avoiding early morning hours when fog is prevalent. The use of masks during agricultural burning periods is strongly advised, and maintaining indoor air quality through ventilation and air purifiers can provide additional protection.