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Kottagudi Muttanād, nestled in the Kanyakumari district of Tamil Nadu, India, occupies a geographically significant position at the cusp of the Western Ghats and the Bay of Bengal. Its coordinates (10.0133° N, 77.0633° E) place it within a coastal plain characterized by relatively low elevation, averaging around 30-50 meters above sea level. The surrounding landscape is a mosaic of agricultural fields – predominantly rice paddies and coconut groves – interspersed with pockets of dense tropical vegetation typical of the region. The proximity to the Western Ghats, while providing a scenic backdrop, also influences local weather patterns and, consequently, air quality. These hills act as a barrier, sometimes trapping pollutants, particularly during periods of low wind speed. The city’s location near the coast means it is susceptible to sea breezes, which can both disperse pollutants and, under certain conditions, carry saline aerosols impacting respiratory health. The urban–rural gradient is gradual; Kottagudi Muttanād itself is a relatively small settlement, transitioning quickly into agricultural land and then into the forested foothills of the Ghats. While not directly adjacent to major industrial belts, the region supports some agricultural processing activities and small-scale industries, contributing localized pollution sources. The soil composition, largely sandy loam, influences dust generation, especially during the dry season. The Bay of Bengal’s influence moderates temperatures, but also introduces humidity and potential for coastal fog, which can exacerbate air stagnation.

Kottagudi Muttanād experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The southwest monsoon (June to September) brings substantial rainfall, generally leading to improved air quality as precipitation washes away particulate matter and increased wind speeds disperse pollutants. However, heavy rainfall can also lead to increased humidity, potentially fostering the growth of mold and allergens. The pre-monsoon season (March to May) is often characterized by rising temperatures and decreasing humidity, creating conditions conducive to stagnant air and the accumulation of pollutants from agricultural activities like burning crop residue, a common practice in the region. This period frequently sees a noticeable increase in particulate matter. The post-monsoon season (October to November) is transitional, with gradually decreasing rainfall and increasing temperatures. Fog, common during these months, traps pollutants near the ground, leading to localized air quality degradation. The dry season (December to February) is generally the most challenging, with low humidity, minimal rainfall, and frequent temperature inversions, particularly during the early morning hours. These inversions trap cooler air and pollutants near the surface. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods, especially during the pre-monsoon and dry seasons. Maintaining indoor air quality through ventilation and air purification can also be beneficial. Agricultural workers should be particularly mindful of dust exposure and respiratory protection during land preparation and harvesting.