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Tiruvalanjuli, a town in Tamil Nadu, India, rests at coordinates 10.9449°N, 79.3286°E, and supports a population of approximately 14,460. The town is situated within the fertile Cauvery Delta region, a predominantly flat alluvial plain formed by the river’s extensive network of distributaries. This low-lying terrain, close to sea level, influences local air circulation patterns. The surrounding landscape is dominated by intensely cultivated paddy fields, interspersed with coconut groves and occasional palm trees, characteristic of the Tamil Nadu coastal plain. Tiruvalanjuli isn’t a major industrial hub, but benefits from, and is impacted by, the agricultural activity and smaller-scale brick kilns common in the region. The urban-rural gradient is relatively blurred; the town functions as a service centre for the surrounding agricultural communities. Proximity to the Bay of Bengal introduces high humidity and seasonal monsoon influences. Air quality is particularly vulnerable to stagnant air conditions during calmer periods, trapping pollutants from agricultural burning, vehicle emissions on the connecting roadways, and dust from unpaved surfaces. The delta’s flat topography limits natural dispersion, exacerbating localised pollution events. Understanding this geographical context is crucial for assessing and mitigating air quality challenges in Tiruvalanjuli.

Tiruvalanjuli experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, roughly from January to May, sees consistently higher particulate matter concentrations. Reduced rainfall means less atmospheric cleansing, and agricultural practices like post-harvest burning contribute significantly to smoke and haze. Hotter temperatures also promote the formation of ground-level ozone. February and March are typically the least favourable months for outdoor activity for those with respiratory sensitivities. The southwest monsoon arrives in June, bringing relief from the heat and a temporary improvement in air quality as rainfall washes away pollutants. However, increased humidity can also foster mould growth. The northeast monsoon, from October to December, is the primary rainfall season, offering the most sustained period of cleaner air. November and December are generally the best months for outdoor activities. During the monsoon, stagnant conditions can still occur between rainfall events, leading to localised pollution build-up. Fog, common during cooler mornings, can trap pollutants near the ground, particularly in November. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit exposure during dry periods and periods of stagnant air.