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Mallagunta, a small town in Tamil Nadu, India, sits at coordinates 12.6343°N, 78.5194°E, within the broader Salem district. The terrain is largely characterised by relatively flat plains, typical of the Kaveri River basin’s influence, though gentle undulations are present. The town’s elevation is modest, contributing to limited natural dispersion of pollutants. Mallagunta is not directly adjacent to a major body of water, though smaller irrigation tanks and channels are common, supporting the surrounding agricultural land. The region is predominantly agricultural, with significant cultivation of rice, sugarcane, and other crops. However, the proximity to Salem, a growing industrial hub, introduces a crucial factor impacting air quality. Industrial activity in Salem, including cement factories and textile mills, contributes to particulate matter and gaseous pollutants that can be transported by prevailing winds towards Mallagunta. The urban-rural gradient is noticeable; as one moves away from Salem, air quality generally improves, but Mallagunta still experiences the spillover effects. The town’s compact size and limited green spaces further exacerbate the potential for localised pollution build-up, particularly from vehicular emissions and biomass burning. Understanding this interplay of agricultural practices, industrial influence, and local topography is vital for assessing and mitigating air quality challenges in Mallagunta.

Mallagunta experiences a tropical climate, with distinct wet and dry seasons heavily influencing air quality. The dry season, roughly from January to May, sees consistently higher pollution levels. Lower humidity and stagnant air, coupled with increased dust from agricultural activities and potential biomass burning for land preparation, contribute to elevated particulate matter. February and March are typically the worst months for respiratory issues. The onset of the southwest monsoon in June brings a significant, though often temporary, improvement. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, monsoon rains can also lead to localised flooding and the spread of waterborne pollutants. Post-monsoon, from September to November, sees a gradual return of drier conditions and a corresponding increase in particulate matter. December offers a brief respite with cooler temperatures and slightly improved air circulation. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the peak dry season. During the monsoon, precautions against waterborne illnesses are crucial. Monitoring wind patterns is key; winds from the direction of Salem will likely carry higher pollution levels.