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Kulattuppālaiyam, nestled in the Coimbatore district of Tamil Nadu, India, occupies a geographically significant position within the Kaveri River basin. Located at approximately 10.76° N latitude and 77.58° E longitude, the town’s terrain is predominantly undulating, characteristic of the foothills of the Western Ghats. This proximity to the Ghats influences local climate patterns and, crucially, air circulation. The surrounding landscape is a blend of agricultural fields – primarily cultivating crops like paddy, sugarcane, and coconut – and pockets of dry deciduous forests, contributing to both biogenic volatile organic compound (BVOC) emissions and potential dust sources. The Kaveri River, though not directly adjacent, exerts a moderating influence on the local microclimate, potentially impacting humidity levels and atmospheric stability. Kulattuppālaiyam’s urban character is that of a developing town, transitioning from a rural agricultural base to a more urbanized setting. The urban–rural gradient is relatively sharp, with the immediate vicinity exhibiting denser residential areas and small-scale commercial activity, gradually giving way to agricultural land and scattered settlements further out. While not situated directly within a major industrial belt, Coimbatore’s industrial zones, including those focused on textiles and engineering, lie within a reasonable radius, potentially contributing to regional air pollution transported via prevailing winds. The elevation, though modest, can influence the dispersion of pollutants, particularly during periods of temperature inversion. The town’s location within a relatively flat plain, punctuated by gentle slopes, means that stagnant air conditions can readily develop, exacerbating local pollution episodes.

Kulattuppālaiyam experiences a tropical climate with distinct wet and dry seasons, significantly impacting air quality dynamics. The dry season, typically spanning from March to May, is characterized by high temperatures and low humidity. This period often witnesses elevated levels of particulate matter, largely due to increased dust resuspension from agricultural activities like plowing and harvesting, combined with stagnant air conditions. Temperature inversions, common during these months, trap pollutants near the ground, worsening air quality. The monsoon season, from June to September, brings relief through rainfall, effectively scrubbing the atmosphere and reducing pollutant concentrations. However, the onset of the monsoon can initially be accompanied by increased humidity and fog, which can temporarily trap pollutants. October and November represent a transitional period, with gradually decreasing temperatures and a reduction in rainfall, leading to a stabilization of air quality. December and January are generally the coolest months, with relatively cleaner air due to increased wind speeds and atmospheric mixing. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor exertion during peak pollution hours, typically mid-morning to early afternoon. Agricultural workers should utilize appropriate respiratory protection during field activities. The monsoon months, while generally cleaner, can still pose challenges due to humidity and potential fungal spore exposure. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year.