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Karambakkudi, a small town in the Sivaganga district of Tamil Nadu, India, sits at coordinates 10.4587°N, 79.1410°E. The terrain is largely flat, characteristic of the Cauvery Delta region, with an elevation hovering around 40-50 meters above sea level. This low-lying geography contributes to limited natural dispersion of pollutants. The town is embedded within a predominantly agricultural landscape, primarily paddy fields, interspersed with coconut groves and scattered rural settlements. While not directly on the coast, Karambakkudi is situated inland from the Palk Strait, approximately 40km away, meaning it experiences a maritime-influenced climate but lacks the direct cleansing effect of sea breezes. The surrounding region is densely populated with numerous smaller towns and villages, creating a complex urban-rural gradient. Industrial activity is limited within Karambakkudi itself, but the broader region sees some brick kilns and small-scale agricultural processing units. Dust from agricultural practices, particularly during harvest seasons, is a significant local contributor to particulate matter. The town’s position within this agricultural heartland, coupled with regional population density, shapes its unique air quality challenges. Road traffic, though not as intense as in major metropolitan areas, is a growing source of emissions, particularly from two-wheelers and agricultural vehicles.

Karambakkudi experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, from February to May, sees consistently higher levels of particulate matter due to reduced rainfall and increased dust from agricultural activities. Hot, dry winds exacerbate the situation, limiting pollutant dispersion. March and April are typically the least favourable months for outdoor activity, particularly for those with respiratory conditions. The southwest monsoon arrives in June, bringing significant rainfall that temporarily washes pollutants from the air, resulting in improved air quality. However, increased humidity can also foster mould growth, impacting sensitive individuals. 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 transition periods – May/June and September/October – air quality can be unpredictable, with intermittent rainfall and fluctuating wind patterns. Temperature inversions, common during cooler nights, can trap pollutants near ground level, worsening conditions. Sensitive groups, including children, the elderly, and those with pre-existing respiratory illnesses, should limit strenuous outdoor activity during the dry season and periods of stagnant air.