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Perunkolattūr, nestled in the Tiruchirappalli district of Tamil Nadu, India, occupies a geographically significant position within the Kaveri Delta, a fertile and densely populated region. Located at approximately 12.0430° N latitude and 78.9174° E longitude, the town’s terrain is predominantly flat, characteristic of the deltaic plains formed by the Kaveri River. The elevation is relatively low, rarely exceeding 20 meters above sea level, contributing to a generally stable atmospheric layer, though also potentially exacerbating ground-level pollutant accumulation under certain conditions. The surrounding landscape is a mosaic of agricultural fields – primarily rice paddies and sugarcane plantations – interspersed with smaller villages and scattered groves of coconut and mango trees. This intensive agricultural activity, while vital to the regional economy, introduces sources of air pollution through fertilizer application, pesticide spraying, and biomass burning during harvest seasons. Perunkolattūr’s proximity to the Cauvery River itself provides a degree of humidity and influences local weather patterns, potentially affecting pollutant dispersion. While not directly adjacent to major industrial belts, the town is within reasonable commuting distance of Tiruchirappalli, a growing industrial and commercial hub, meaning industrial emissions can occasionally impact air quality. The urban–rural gradient around Perunkolattūr is gradual, with agricultural land transitioning seamlessly into residential areas, a common feature of deltaic settlements, and influencing the distribution of pollution sources and receptors.

Perunkolattūr experiences a tropical climate with distinct wet and dry seasons, significantly influencing its air quality profile. The dry season, typically spanning from March to May, often sees a gradual increase in particulate matter due to increased agricultural activity, including controlled burns for land preparation and residue disposal. Temperature inversions, more frequent during this period, trap pollutants closer to the ground, particularly in the early morning hours. The monsoon season, arriving around June and lasting through September, brings relief through increased rainfall, which naturally scavenges pollutants from the atmosphere. However, the onset of the monsoon can also be accompanied by increased dust and humidity, potentially impacting respiratory health. October and November represent a transitional period, with decreasing rainfall and gradually rising temperatures, potentially leading to a resurgence of particulate matter. Fog, common during the cooler months (December-February), can significantly reduce visibility and trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season and periods of fog, limiting outdoor exertion and ensuring adequate ventilation. Agricultural workers are particularly vulnerable and should utilize appropriate protective equipment during burning activities. Public health advisories regarding biomass burning and dust levels are crucial during these periods to mitigate potential health impacts.