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Madukkūr, a municipality in Tamil Nadu, India, occupies a relatively flat terrain within the fertile Kaveri Delta region. Located at approximately 10.48°N latitude and 79.40°E longitude, the town’s geography is fundamentally shaped by its proximity to the Kaveri River and its tributaries. The surrounding landscape is predominantly agricultural, characterized by extensive paddy fields, coconut groves, and sugarcane cultivation. This intensive agriculture, while economically vital, contributes to localised air quality concerns through practices like crop residue burning. Madukkūr’s elevation is low, averaging around 35 meters above sea level, which limits natural dispersion of pollutants. The urban-rural gradient is fairly sharp; the town itself is a concentrated settlement amidst a largely rural backdrop. While not a major industrial hub, smaller-scale brick kilns and agricultural processing units operate in the vicinity, adding to particulate matter emissions. The deltaic environment also means high humidity for much of the year, influencing pollutant behaviour. The town’s position within the broader Tamil Nadu plains means it’s susceptible to regional air mass movements, potentially transporting pollutants from larger urban centres and industrial areas further afield. Understanding this interplay of agricultural practices, local industry, and regional transport is crucial for assessing Madukkūr’s air quality.

Madukkūr experiences a tropical climate with distinct wet and dry seasons, heavily influencing its air quality. The dry season, roughly from January to May, sees a build-up of particulate matter due to drier conditions and increased dust suspension from agricultural activities. February and March are often the worst months, with stagnant air and limited rainfall exacerbating pollution. The southwest monsoon arrives in June, bringing significant rainfall that washes away pollutants, resulting in a temporary improvement in air quality. However, increased humidity can also promote the formation of secondary pollutants. The northeast monsoon, from October to December, is the primary rainfall season, offering the most substantial cleansing effect. November typically sees the clearest air. During the monsoon months, mould spores become a concern for allergy sufferers. Temperature inversions, common during the cooler months, trap pollutants near the ground, worsening air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season and periods of stagnant air. Monitoring wind patterns is crucial; winds from industrial areas to the north can bring increased pollution. Overall, the wet seasons offer respite, while the dry season demands increased vigilance.