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Kallamalai, nestled in the Wayanad district of Kerala, India, occupies a geographically significant position within the Western Ghats mountain range. Located at approximately 11.0489° N latitude and 76.5691° E longitude, the city’s elevation, averaging around 1200 meters above sea level, contributes to a cooler climate and influences local air circulation patterns. The surrounding landscape is dominated by lush, evergreen forests, tea plantations, and spice farms, characteristic of Kerala’s agricultural heartland. This proximity to agricultural zones, while providing economic sustenance, can also introduce localized sources of air pollutants, particularly during harvest seasons when biomass burning for land clearing may occur. The urban–rural gradient around Kallamalai is relatively sharp; the city itself is small, with a population of just over 12,000, transitioning quickly into rural agricultural lands and dense forest cover. The city’s terrain is undulating, with steep slopes and valleys, which can trap pollutants and limit dispersion, especially during periods of low wind speed. While Kallamalai lacks direct proximity to major rivers, it benefits from the region’s high rainfall and numerous streams, contributing to relatively high humidity. There are no significant industrial belts immediately adjacent to Kallamalai, mitigating large-scale industrial pollution. However, the city’s connectivity to larger towns and cities in Kerala via road networks means that vehicular emissions represent a notable factor in its air quality profile. The Western Ghats act as a barrier, influencing wind patterns and potentially trapping pollutants within the region.

Kallamalai’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting its air quality. The monsoon season, typically spanning June to September, brings torrential rainfall, effectively cleansing the atmosphere and significantly reducing particulate matter. High rainfall washes away dust and pollutants, leading to the cleanest air quality during these months. However, the preceding pre-monsoon period (March-May) often experiences elevated levels of pollutants due to increased biomass burning for agricultural purposes and stagnant air conditions. Temperature inversions, common during these months, trap pollutants near the ground, exacerbating the situation. The post-monsoon season (October-November) sees a gradual improvement in air quality as rainfall decreases, but humidity remains high. The dry season (December-February) is characterized by lower rainfall and increased sunshine, but can also bring periods of fog, particularly in the mornings. Fog, while visually appealing, can trap pollutants and reduce visibility. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon period and on days with dense fog. Outdoor activities are generally best enjoyed during the monsoon months when air quality is at its peak. While the surrounding forests contribute to cleaner air overall, localized agricultural practices and occasional vehicular traffic remain key factors influencing air quality fluctuations throughout the year. Maintaining awareness of weather conditions and minimizing exposure during periods of stagnant air is crucial for protecting respiratory health.