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Vettikattiri, nestled in the Kannur district of Kerala, India, occupies a geographically significant position within the Western Ghats foothills. Located at approximately 11.1167° N latitude and 76.1833° E longitude, the village experiences a unique interplay of coastal and mountainous influences. The surrounding landscape is dominated by lush tropical forests, interspersed with small-scale agricultural plots primarily cultivating spices, coconut, and areca nut – characteristic of Kerala’s rural economy. Elevation varies gently, rising from approximately 30 meters above sea level near the coastal plains to around 150 meters closer to the foothills, creating localized microclimates. The proximity to the Arabian Sea, roughly 15 kilometers to the west, moderates temperatures and introduces maritime air masses, but also presents a potential pathway for coastal pollutants. While Vettikattiri itself is a small village, it sits within a broader regional context. Larger industrial zones are located further north, towards Kozhikode, and their emissions can occasionally be transported by prevailing winds. The urban–rural gradient is relatively sharp; Vettikattiri retains a distinctly rural character, with limited vehicular traffic and industrial activity within its immediate boundaries. However, the increasing use of motorcycles and occasional agricultural burning during harvest seasons can contribute to localized air quality fluctuations. The terrain, with its undulating hills and dense vegetation, can also trap pollutants, particularly during periods of low wind speed, influencing the dispersion of any emissions.

Vettikattiri’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The southwest monsoon, typically spanning from June to September, brings torrential rainfall, effectively scrubbing the atmosphere and significantly reducing particulate matter and gaseous pollutants. This period generally offers the best air quality, with frequent rain showers acting as a natural filter. Conversely, the pre-monsoon months (March-May) often experience a build-up of pollutants due to stagnant air and rising temperatures. The lack of rainfall combined with increased agricultural activity, including controlled burns for land clearing and crop residue disposal, contributes to elevated levels of smoke and particulate matter. During these months, temperature inversions, where cooler air is trapped beneath a layer of warmer air, can further exacerbate the problem, preventing pollutants from dispersing vertically. The post-monsoon season (October-November) sees a gradual improvement in air quality as rainfall decreases and wind speeds increase, though occasional fog can temporarily trap pollutants. Outdoor activities are generally best enjoyed during the monsoon months (June-September) and the post-monsoon period (October-November). Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon months (March-May) and avoid prolonged exposure to outdoor air, particularly on days with visible smoke or haze. Maintaining indoor air quality through ventilation and air purification can also be beneficial during periods of poorer air quality.