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Kolachel, nestled in the Kanyakumari district of Tamil Nadu, India, occupies a unique coastal position at the southeastern tip of the Indian peninsula. Its coordinates (8.1767° N, 77.2591° E) place it within a region characterized by a gradual transition from the Western Ghats foothills to the Arabian Sea. The terrain is predominantly undulating, with gentle slopes rising towards the inland areas, influencing local wind patterns and potential for pollutant accumulation. The city’s proximity to the sea, approximately 3 kilometers, introduces a maritime influence, moderating temperatures but also potentially carrying marine aerosols and salt particles that can impact air quality. Surrounding Kolachel is a mosaic of agricultural land, primarily focused on coconut, paddy, and banana cultivation, alongside smaller plots of spice crops. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter from burning agricultural residue, although this is generally less prevalent than in northern India. To the north and west, the landscape gradually shifts to more densely vegetated areas, offering some natural air filtration. The urban–rural gradient around Kolachel is relatively smooth, with smaller villages and agricultural settlements blending into the urban fabric. The absence of major heavy industries within Kolachel itself is a mitigating factor, though the broader Kanyakumari district experiences some industrial activity further inland, potentially impacting regional air quality. Elevation is relatively low, averaging around 20-30 meters above sea level, which can exacerbate temperature inversions under certain meteorological conditions, trapping pollutants closer to the ground.

Kolachel’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing its air quality profile. The southwest monsoon, typically from June to September, brings abundant rainfall, effectively cleansing the atmosphere and reducing particulate matter concentrations. Strong onshore winds associated with the monsoon disperse pollutants, leading to generally improved air quality during these months. October to December marks a transitional period, with decreasing rainfall and a gradual increase in temperature. This period can see a slight uptick in pollutants, particularly if agricultural burning occurs in surrounding areas. January and February constitute the driest and warmest months, and are often associated with periods of stagnant air and potential for localized pollution build-up. Temperature inversions, where a layer of warm air traps cooler air below, are more likely to occur during these months, especially in the early morning hours, hindering vertical mixing and concentrating pollutants near the ground. Fog, common during the winter months, further exacerbates this issue by reducing visibility and trapping pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. The monsoon season offers the most favourable conditions for outdoor activities. While agricultural practices can contribute to localized pollution during the transitional months, the overall impact is less severe than in regions with extensive industrial activity. Maintaining awareness of local weather patterns and air quality conditions is crucial for minimizing exposure and protecting respiratory health.