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Melmuri, nestled within the verdant landscape of Kerala, India, occupies a relatively low-lying position at approximately 11.1806°N, 76.0167°E. The city’s geography is defined by the undulating terrain characteristic of the Western Ghats foothills, though Melmuri itself is situated closer to the coastal plains. This proximity to the Arabian Sea exerts a significant influence on the local climate, contributing to high humidity and moderate temperatures. The surrounding landscape is dominated by lush coconut groves, paddy fields, and rubber plantations – typical of Kerala’s agricultural heartland. While not a major industrial hub, the region supports small-scale processing of agricultural products, and increasing localised construction activity. The urban-rural gradient is fairly sharp; Melmuri is a relatively small town, quickly transitioning to rural agricultural areas. This impacts air quality as agricultural practices, including seasonal burning of crop residue, can contribute to particulate matter. The relatively flat terrain and coastal location can also trap pollutants during periods of calm weather, hindering dispersion. The dense vegetation, while beneficial overall, can also contribute to biogenic volatile organic compounds (BVOCs) which react to form ozone under certain conditions. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Melmuri.

Melmuri experiences a distinct tropical climate, broadly categorised into wet and dry seasons, profoundly impacting air quality. The southwest monsoon, typically arriving in June and lasting until September, brings heavy rainfall which effectively washes particulate matter from the atmosphere, resulting in generally cleaner air during these months. However, increased humidity can also foster mould growth, impacting respiratory health. October to February constitutes the drier season, marked by lower rainfall and calmer winds. This period often sees a build-up of pollutants, particularly from localised sources like vehicle emissions and agricultural burning as fields are prepared for the next crop. January and February are often the months with the least atmospheric cleansing. March to May is the hottest period, with increased temperatures promoting the formation of ground-level ozone. Temperature inversions, common during calm mornings, can trap pollutants near the ground, exacerbating air quality issues. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods. Fog, prevalent during cooler months, can also trap pollutants. Avoiding outdoor exertion during peak heat and calm conditions is advisable, and monitoring personal health is crucial.