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Manantanna, a small town nestled within the coastal state of Kerala, India, occupies a geographically significant position at coordinates 11.9125°N, 75.7569°E. With a population of approximately 15,935, it’s characterized by a relatively flat terrain typical of the Kerala coastline, though gentle undulations are present as the land rises slightly inland. The Arabian Sea exerts a strong influence on the local climate and, consequently, air quality. Manantanna benefits from the moderating effects of the sea breeze, but is also susceptible to humidity and salt spray. The surrounding landscape is a mosaic of coconut plantations, paddy fields, and increasingly, residential areas. While not a major industrial hub itself, Manantanna’s proximity to larger industrial zones further north along the Kerala coast introduces the potential for long-range pollutant transport. The urban-rural gradient is fairly sharp; the town is surrounded by agricultural land, meaning seasonal burning of agricultural waste can contribute to localised air pollution. The dense vegetation generally aids in some pollutant absorption, but the narrow streets and limited vehicular traffic management can lead to pockets of concentrated emissions. Understanding this interplay of coastal influences, agricultural practices, and developing urbanisation is crucial for assessing and mitigating air quality challenges in Manantanna.

Manantanna experiences a tropical climate, broadly defined by wet and dry seasons rather than traditional four seasons. Air quality is most favourable during the monsoon season (June-September), as heavy rainfall effectively washes away particulate matter and suppresses dust. However, the increased humidity can also foster mould growth, impacting respiratory health. The post-monsoon period (October-November) sees a gradual improvement in air quality, with cooler temperatures and calmer winds. The dry season (December-February) presents the most challenging conditions. Lower rainfall and increased wind speeds can stir up dust and pollutants, particularly from construction and agricultural activities. Temperature inversions, common during cooler months, trap pollutants near ground level, exacerbating the situation. March-May, the hottest period, often sees a build-up of ozone due to increased sunlight and stagnant air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. Burning of agricultural residue after the harvest in April/May significantly degrades air quality. Monitoring wind patterns is vital; onshore winds bring marine aerosols, while winds from inland can carry pollutants from agricultural and industrial sources.