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Eral, a small town nestled in the Thanjavur district of Tamil Nadu, India, occupies a geographically significant position within the Cauvery Delta, a fertile and densely populated region. Located at approximately 8.6258° N latitude and 78.0228° E longitude, Eral’s terrain is predominantly flat, characteristic of the deltaic plains formed by the Cauvery River. The elevation is minimal, rarely exceeding 10 meters above sea level, contributing to a low-lying landscape susceptible to flooding during the monsoon season. The town is surrounded by extensive agricultural lands, primarily rice paddies and sugarcane fields, which define the immediate rural landscape. Further afield, the terrain gradually rises towards the interior of Tamil Nadu. Eral’s proximity to the Bay of Bengal, roughly 60 kilometers to the southeast, influences local weather patterns and can impact air quality through sea breezes and occasional saline aerosol deposition. While Eral itself is a relatively small urban center, it sits within a broader industrial belt concentrated around Thanjavur and nearby cities like Kumbakonam, which includes rice mills, textile units, and small-scale manufacturing. This proximity introduces potential sources of industrial pollution. The urban-rural gradient around Eral is gradual, with agricultural activities seamlessly blending into the town’s periphery. The flat topography and prevailing wind patterns, often influenced by the monsoon, can lead to the stagnation of pollutants, particularly during periods of low wind speed, impacting local air quality. The surrounding landscape, dominated by agriculture, also contributes to particulate matter through agricultural burning practices, a seasonal concern.

Eral’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from March to May, often witnesses a noticeable increase in particulate matter. This is largely attributable to increased agricultural burning as farmers clear fields for the next planting season. The lack of rainfall during this period allows these pollutants to accumulate, exacerbated by higher temperatures which promote photochemical reactions. The monsoon season, from June to September, brings relief through frequent rainfall, effectively washing away pollutants and significantly improving air quality. However, the onset of the monsoon can initially be accompanied by increased humidity and fog, which can trap pollutants close to the ground, creating temporary periods of reduced visibility and elevated particulate concentrations. October and November represent a transitional period, with decreasing rainfall and gradually increasing temperatures, potentially leading to a slow return of pre-monsoon conditions. December and January are generally cooler and drier, with relatively stable air quality, 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, limiting prolonged outdoor exposure and avoiding strenuous activity, particularly during periods of agricultural burning. During the monsoon, while overall air quality improves, those with allergies should be mindful of increased pollen counts and humidity.