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Nanāttupārai, nestled in the coastal state of Kerala, India, occupies a geographically significant position within the broader Malabar region. Located at approximately 9.3790° N latitude and 76.8779° E longitude, the village sits on a gently sloping terrain, characteristic of Kerala's coastal plains. Its proximity to the Arabian Sea (roughly 5km inland) exerts a considerable influence on local climate and, consequently, air quality. The surrounding landscape is a mosaic of lush paddy fields, coconut groves, and small-scale plantations, typical of Kerala’s agricultural heartland. This rural character gradually transitions into a more urbanized setting as one moves towards larger towns and cities further inland. The elevation is relatively low, rarely exceeding 30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. While Nanāttupārai itself is a small village, it’s situated within a region experiencing increasing development pressure. Nearby industrial zones, primarily focused on cashew processing and light manufacturing, contribute to localized pollution sources. The urban–rural gradient is relatively smooth, with agricultural activities and traditional livelihoods still prevalent, but the influence of regional urban centers is steadily growing, bringing with it increased vehicular traffic and associated emissions. The prevailing winds, generally southwesterly during the monsoon and northeasterly during the dry season, play a crucial role in dispersing or concentrating pollutants within the local atmosphere. The coastal location also means that sea breezes can significantly impact air quality patterns.

Nanāttupārai’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting air quality. The southwest monsoon, typically spanning from June to September, brings abundant rainfall, effectively cleansing the atmosphere and significantly reducing particulate matter. This period generally offers the best air quality for outdoor activities. However, the onset of the monsoon can be accompanied by increased humidity, which can exacerbate respiratory issues for sensitive individuals. The dry season, from October to May, presents a different set of challenges. Reduced rainfall and lower humidity often lead to a build-up of pollutants, particularly during the cooler months (December-February). Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during this period, further hindering pollutant dispersion. Fog, common in the mornings during the dry season, also contributes to the concentration of pollutants close to the ground. Agricultural burning, a common practice in surrounding areas during the pre-monsoon period (March-May), can significantly elevate particulate matter levels. Individuals with respiratory conditions, the elderly, and young children should exercise caution during these months, limiting prolonged outdoor exposure and avoiding strenuous activity. The transition periods – the onset and withdrawal of the monsoon – can be unpredictable, with fluctuating air quality influenced by shifting wind patterns and sporadic rainfall. Overall, the monsoon months offer respite, while the dry season demands heightened awareness and precautionary measures to protect respiratory health.