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Martūru, a small town nestled within the verdant landscape of Kerala, India, occupies a geographically significant position at coordinates 10.1694°N, 76.4292°E. Situated in the Thrissur district, the town’s terrain is largely characterised by the undulating plains typical of Kerala’s coastal belt, though gently rising elevations are present as the land moves inland. The Arabian Sea lies relatively close, influencing the climate and contributing to high humidity levels. Martūru isn’t a major industrial hub, but its surrounding areas feature a mix of agricultural land – primarily rice paddies and coconut plantations – and small-scale brick kilns and rubber processing units. This blend of land use contributes to localised pollution sources. The urban-rural gradient is quite sharp; Martūru itself is a relatively compact settlement, quickly giving way to dense vegetation and agricultural fields. This proximity to natural landscapes offers some buffering capacity, but also means pollutants can be trapped in the humid air, particularly during periods of calm weather. The town’s location within a tropical region means consistent warmth and high rainfall, impacting pollutant dispersion. The relatively flat terrain limits natural ventilation, potentially exacerbating air quality issues during stagnant conditions. Understanding this interplay of geography and land use is crucial for addressing air quality concerns in Martūru.

Martūru experiences a distinct wet and dry season, heavily influenced by the Southwest Monsoon. Air quality generally improves significantly during the monsoon months (June-September) as heavy rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also foster mould growth, impacting respiratory health. The post-monsoon season (October-November) sees a gradual return of drier conditions and a corresponding increase in dust and localised pollutants from agricultural activities like harvesting and burning crop residue. December to February represents the driest period, often accompanied by cooler temperatures and a greater risk of temperature inversions, trapping pollutants near the ground. This is typically when air quality is at its poorest. March to May brings rising temperatures and increased convective activity, which can help disperse pollutants, but also coincides with increased activity in brick kilns and rubber processing, potentially offsetting the benefits. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly February to May. Monitoring local weather patterns and avoiding peak activity times near industrial or agricultural sources is advisable.