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Arasūr, nestled in the Dharmapuri district of Tamil Nadu, India, occupies a geographically significant position within the broader Deccan Plateau region. Located at approximately 11.0866° N latitude and 77.1146° E longitude, the town sits at an elevation of roughly 550 meters (1800 feet) above sea level, contributing to a relatively moderate climate. The surrounding landscape is characterized by undulating hills and plains, typical of the region's granite-gneiss terrain. Arasūr’s proximity to the Cauvery River, though not directly on its banks, influences local humidity and microclimates. The town’s urban character is primarily rural, with a slowly developing commercial center reflecting its role as a local market town. The urban–rural gradient is gradual, transitioning quickly into agricultural lands dominated by crops like paddy, ragi, and groundnut. To the west, the landscape rises towards the Western Ghats, impacting prevailing wind patterns. While Arasūr itself lacks major heavy industries, it’s situated within a region experiencing increasing agricultural intensification, potentially leading to localized pollution from fertilizer use and biomass burning during harvest seasons. The town’s relatively isolated location, while offering some protection from large-scale industrial pollution, can also trap pollutants under certain meteorological conditions, particularly during periods of low wind speed and temperature inversions. The surrounding topography plays a crucial role in air circulation, influencing the dispersion of any locally generated emissions.

Arasūr experiences a tropical wet-dry climate, dictating a distinct seasonal pattern in air quality. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants as consistent rainfall washes particulate matter from the atmosphere and strong winds disperse emissions. However, the pre-monsoon period (March-May) often witnesses a build-up of pollutants due to stagnant air and increased agricultural activity, including burning of crop residue. This period is generally characterized by higher temperatures and lower humidity, exacerbating the effects of any particulate matter present. The post-monsoon season (October-November) sees a gradual improvement in air quality as rainfall decreases and wind speeds pick up, though occasional fog can trap pollutants near ground level. Winter months (December-February) are typically drier with cooler temperatures, and while generally offering better air quality, the potential for temperature inversions – where a layer of warm air traps cooler air and pollutants near the ground – can lead to localized spikes in pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, particularly on days with fog or stagnant air. Outdoor activities are generally more favorable during the monsoon and post-monsoon seasons. Agricultural practices, especially burning, significantly impact air quality, making awareness of local agricultural cycles crucial for understanding pollution trends. Reduced biomass burning and improved agricultural techniques are key to mitigating seasonal air quality fluctuations.