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Keevallur, a small town nestled in the Palakkad district of Kerala, India, occupies a relatively low-lying position at approximately 11.9167°N, 75.5500°E. The terrain is predominantly flat, characteristic of the coastal plains of Kerala, though gently undulating as it transitions inland. Keevallur is situated within a rich agricultural landscape, primarily paddy fields and coconut groves, typical of this region. The Bharathapuzha River, also known as the Nila, flows nearby, influencing local humidity and potentially contributing to localised temperature inversions. While not directly within a major industrial belt, the broader Palakkad district experiences some industrial activity related to food processing and small-scale manufacturing, which can contribute to regional background pollution levels. The urban-rural gradient is quite sharp; Keevallur itself is a relatively small settlement surrounded by extensive rural areas. This proximity to agricultural land means seasonal burning of crop residue after harvest is a potential source of particulate matter. The coastal location means the town is also susceptible to sea breezes, which can either disperse or concentrate pollutants depending on prevailing weather conditions. The dense vegetation surrounding Keevallur offers some natural filtration, but its capacity is limited by the scale of potential emissions. Understanding this interplay of geography and land use is crucial for assessing air quality in Keevallur.

Keevallur experiences a distinct tropical climate, primarily defined by wet and dry seasons rather than traditional four seasons. Air quality generally improves during the Southwest Monsoon (June-September) as heavy rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also foster mould growth, potentially impacting respiratory health. The post-monsoon season (October-November) sees a gradual increase in pollution as agricultural activities resume, including crop residue burning, releasing significant amounts of smoke and particulate matter. This is often a period of calmer winds, exacerbating the issue. The dry season (December-February) typically presents the poorest air quality. Lower rainfall and increased temperatures lead to higher concentrations of dust and pollutants. Temperature inversions, common during cooler mornings, trap pollutants near ground level. March-May, the hottest period, sees further deterioration as dry winds carry dust from inland areas. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. Monitoring local weather patterns and avoiding peak agricultural burning times are crucial for protecting health. The transition periods between seasons often experience fluctuating air quality, requiring increased vigilance.