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Puliyankunnu, nestled in the Alappuzha district of Kerala, India, occupies a geographically significant position within the state’s coastal plains. Located at approximately 9.4120° N latitude and 76.4100° E longitude, the village experiences a predominantly flat terrain, typical of Kerala’s backwater region. Its proximity to the Arabian Sea, roughly 15 kilometers to the west, exerts a considerable influence on the local climate and, consequently, air quality. The surrounding landscape is characterized by a mosaic of rice paddies, coconut groves, and smaller agricultural plots, forming a gradual urban-rural gradient as one moves inland. While Puliyankunnu itself is a relatively small village, it’s situated within a region experiencing increasing urbanization and agricultural intensification. The nearby Alappuzha city, a significant urban center, introduces potential sources of pollution, including vehicular emissions and industrial activity, which can be transported by prevailing winds. The elevation is low, generally below 10 meters above sea level, which can exacerbate the trapping of pollutants during periods of temperature inversion, particularly during the cooler months. The backwaters themselves, a network of lagoons, lakes, and canals, contribute to the local humidity and can influence the dispersion of airborne particles. Agricultural practices, including the burning of crop residue (though increasingly regulated), can also contribute to localized air pollution events. The region’s dense vegetation generally acts as a natural filter, but the increasing population density and external influences pose ongoing challenges to maintaining clean air.

Puliyankunnu’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality throughout the year. The southwest monsoon, typically spanning from June to September, brings torrential rainfall and strong winds, effectively flushing out accumulated pollutants and generally improving air quality. This period is often the most pleasant for outdoor activities, although heavy downpours can temporarily reduce visibility. The pre-monsoon season (March-May) is often characterized by rising temperatures and humidity, creating conditions conducive to the build-up of pollutants. Stagnant air and occasional temperature inversions, where cooler air is trapped beneath warmer air, can lead to localized pollution episodes. The post-monsoon season (October-November) sees a gradual decrease in rainfall and a return of warmer temperatures, with a potential for fog formation, particularly in the mornings. Fog can trap pollutants near the ground, reducing air quality. During the dry season, agricultural activities, including the use of fertilizers and pesticides, can contribute to airborne particulate matter. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, particularly on days with stagnant air or fog. While the monsoon provides a natural cleansing effect, the overall air quality is influenced by regional pollution sources and agricultural practices. Avoiding strenuous outdoor activity during periods of reduced visibility and high humidity is generally advisable. The increased humidity can also exacerbate respiratory issues for some individuals.