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Tittachcheri, a small town in Tamil Nadu, India, is situated at coordinates 10.8674°N, 79.7893°E, within the fertile Cauvery Delta region. The landscape is predominantly flat, characteristic of alluvial plains formed by the river system. This low-lying terrain, with an elevation generally under 10 meters, influences air dispersion patterns, potentially trapping pollutants during calm weather conditions. The town’s proximity to the Bay of Bengal introduces humid air masses and seasonal monsoon influences. Surrounding Tittachcheri are extensive agricultural lands, primarily dedicated to rice cultivation, a common feature of the delta. While not a major industrial hub itself, the region benefits from, and is potentially impacted by, industrial activity in nearby cities like Thanjavur and Nagapattinam. The urban-rural gradient is relatively sharp; Tittachcheri represents a concentrated settlement within a largely agrarian landscape. Dust from agricultural practices, particularly during harvesting and land preparation, contributes to particulate matter in the air. The dense network of irrigation canals, while vital for agriculture, can also create localised humidity that affects pollutant behaviour. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Tittachcheri.

Tittachcheri experiences a tropical climate with distinct wet and dry seasons, heavily influencing its air quality. The dry season, roughly from January to May, sees increased dust levels due to agricultural activities and drier conditions, leading to poorer air quality. February and March are often the most challenging months, with stagnant air and potential for localised burning of agricultural residue exacerbating particulate matter. The Southwest Monsoon arrives in June, bringing relief with rainfall that washes away pollutants, significantly improving air quality. However, increased humidity can also promote the formation of mould and secondary pollutants. The Northeast Monsoon, from October to December, is the primary rain-bearing season for this region, again offering cleansing rains but also potentially increasing dampness and associated respiratory issues. November typically sees a transition period with moderate air quality. During the monsoon seasons, wind speeds increase, aiding dispersion. Temperature inversions are less frequent but can occur during calmer periods, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the dry season and periods of stagnant air, and consider using air purifiers indoors.