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Manganam, a municipality nestled in the Alappuzha district of Kerala, India, occupies a unique geographic position within the state’s intricate network of backwaters and coastal plains. Situated at coordinates 9.7958°N, 76.4500°E, the city’s terrain is predominantly flat, typical of the Kerala coastline, with an elevation barely above sea level. This low-lying landscape is interwoven with canals, rivers, and the famed Vembanad Lake, significantly influencing local climate and air quality. Manganam’s proximity to the Arabian Sea introduces high humidity and moderating sea breezes, but also potential for saltwater intrusion. The surrounding landscape is a mosaic of lush paddy fields, coconut groves, and dense vegetation, characteristic of Kerala’s agricultural heartland. While Manganam isn’t a major industrial hub, the broader Alappuzha district supports coir processing, fishing, and small-scale manufacturing, contributing to localised emissions. The urban-rural gradient is relatively gradual, with agricultural activities extending close to the city centre. This blend of natural features and human activity creates a complex interplay affecting pollutant dispersion and concentration, making understanding local wind patterns crucial for assessing air quality. The dense vegetation can act as a natural filter, but also contribute to biogenic volatile organic compounds (BVOCs).

Manganam experiences a tropical climate, broadly defined by wet and dry seasons rather than traditional four seasons. Air quality in Manganam is most favourable during the monsoon season (June-September). The heavy rainfall effectively washes away particulate matter and suppresses dust, leading to cleaner air. However, increased humidity can also promote mould growth, impacting respiratory health. The post-monsoon season (October-November) sees a gradual improvement in air quality, with decreasing humidity and moderate temperatures. The dry season (December-February) is when air quality tends to deteriorate. Lower rainfall and stagnant air masses allow pollutants from local sources – vehicular emissions, coir processing, and household burning – to accumulate. Temperature inversions, common during cooler mornings, trap pollutants near the ground. March-May, the hottest period, exacerbates this, with increased evaporation and potential for dust suspension. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during these months. Fog, prevalent in cooler months, can also trap pollutants. Monitoring wind direction is key, as pollutants can be transported from nearby urban centres.