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Vammanal, nestled in the Kannur district of Kerala, India, occupies a geographically significant position within the Malabar region. Located at approximately 12.0281° N latitude and 75.7093° E longitude, the town’s terrain is characterized by a gentle slope towards the Arabian Sea, a mere few kilometers to the west. This coastal proximity significantly influences local weather patterns and, consequently, air quality. The surrounding landscape is a mosaic of lush tropical vegetation, predominantly coconut groves and rice paddies, typical of Kerala’s agrarian character. Vammanal sits within a broader urban–rural gradient, transitioning from the denser settlements of Kannur city to the quieter, more dispersed rural communities further inland. Elevation is relatively low, rarely exceeding 30 meters above sea level, minimizing the potential for topographic barriers to air dispersion. While Vammanal itself is a small town, it benefits from and is potentially impacted by industrial activity concentrated in the larger Kannur industrial belt, located approximately 20 kilometers to the north. Agricultural practices, particularly the burning of crop residue after harvest, can also contribute to localized air pollution events. The prevailing winds, generally southwesterly during the monsoon and northwesterly during the dry season, play a crucial role in transporting pollutants, either dispersing them or concentrating them within the local area. The town’s location within a humid, tropical climate further complicates air quality dynamics, influencing the formation and persistence of pollutants.

Vammanal’s air quality experiences a distinct seasonal cycle dictated by Kerala’s monsoon climate. The southwest monsoon, typically spanning from June to September, brings abundant rainfall and strong winds, generally leading to improved air quality as pollutants are washed away and dispersed. However, periods of intense rainfall can also lead to increased humidity, potentially exacerbating respiratory issues for sensitive individuals. The pre-monsoon season (March-May) often sees a rise in temperatures and a decrease in rainfall, creating conditions conducive to stagnant air and the accumulation of pollutants. This period is often characterized by increased dust from construction activities and agricultural practices. The northeast monsoon (October-November), while less intense than the southwest monsoon, still provides some relief from pollution. The dry season (December-February) presents a mixed picture. While temperatures are generally moderate, the lack of rainfall and weaker winds can lead to localized pollution episodes, particularly if agricultural burning occurs. Fog, common during these months, can trap pollutants near the ground, reducing visibility and increasing exposure. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and dry season, limiting outdoor activity during peak pollution hours, typically in the morning and late afternoon. Maintaining indoor air quality through ventilation and air purification can also be beneficial. Awareness of agricultural burning practices and their potential impact is crucial for minimizing exposure.