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Palaiya Āyakkudi, nestled in the Sivaganga district of Tamil Nadu, India, occupies a geographically significant position within the Cauvery Delta region. Located at approximately 10.4560° N latitude and 77.5595° E longitude, the town’s terrain is predominantly flat, characteristic of the fertile delta lands formed by the Cauvery River. The surrounding landscape is a mosaic of agricultural fields, primarily rice paddies and sugarcane plantations, interspersed with smaller villages and scattered groves of mango and coconut trees. This intensive agricultural activity, while vital to the regional economy, contributes to localized air quality challenges. Palaiya Āyakkudi sits relatively close to the Bay of Bengal, approximately 150 kilometers away, influencing regional weather patterns and potentially impacting the transport of pollutants. The elevation is low, generally below 20 meters above sea level, which can exacerbate the trapping of pollutants, particularly during periods of stagnant air. The urban–rural gradient around Palaiya Āyakkudi is gradual; the town itself is a small, primarily residential settlement, transitioning quickly into the surrounding agricultural landscape. While not directly adjacent to major industrial belts, the town’s proximity to larger urban centers like Madurai (approximately 70 kilometers) means it can be affected by pollutants transported from those areas. The flat topography and prevailing wind patterns often dictate the dispersion of emissions, with potential for downwind communities to experience elevated concentrations. The soil composition, rich in alluvial deposits, also influences the deposition of particulate matter.

Palaiya Āyakkudi’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and the influence of the Indian monsoon. The dry season, typically spanning from March to May, often witnesses a noticeable increase in particulate matter concentrations. This is largely attributable to increased agricultural burning – farmers clearing crop residue after harvest – combined with stagnant air conditions. Temperature inversions, common during these months, trap pollutants close to the ground, worsening air quality. The monsoon season, from June to September, brings relief as strong winds and frequent rainfall effectively flush out pollutants. However, the onset of the monsoon can initially be accompanied by increased humidity and fog, which can temporarily reduce visibility and trap pollutants in localized areas. October and November represent a transitional period, with decreasing rainfall and gradually increasing temperatures, potentially leading to a resurgence of agricultural burning. December and January are generally cooler and drier, with relatively better air quality compared to the peak of the dry season, although occasional fog events can still impact local conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion and wearing appropriate masks can help mitigate exposure. During the monsoon, while overall air quality improves, those with allergies should be mindful of increased pollen and mold counts.