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Alangāyam, nestled in the Tiruchirappalli district of Tamil Nadu, India, occupies a geographically significant position within the Kaveri Delta region. Located at approximately 12.6223° N latitude and 78.7521° E longitude, the town’s terrain is predominantly flat, characteristic of the fertile delta lands formed by the Kaveri River and its tributaries. The surrounding landscape is a mosaic of agricultural fields – primarily rice paddies and sugarcane plantations – interspersed with smaller villages and pockets of scrubland. This close proximity to intensive agricultural practices contributes to localized air quality challenges, particularly related to biomass burning during harvest seasons. Alangāyam’s elevation is relatively low, averaging around 110 meters above sea level, which can exacerbate the trapping of pollutants, especially during periods of stagnant air. The town sits within a gradual urban–rural gradient, transitioning from the denser urban core of Tiruchirappalli to the more agrarian setting of the delta. While not directly adjacent to a major river, the influence of the Kaveri’s watershed is undeniable, impacting local climate patterns and humidity levels. The absence of significant topographic barriers means that pollutants originating from industrial areas further north, or even from the broader Trichy metropolitan area, can readily drift into Alangāyam, impacting its air quality. The region's subtropical climate, with hot summers and a distinct monsoon season, further influences atmospheric conditions and pollutant dispersion.

Alangāyam’s air quality experiences a distinct seasonal cycle heavily influenced by the region’s tropical climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. High temperatures and low humidity create stable atmospheric conditions, often leading to temperature inversions where cooler air is trapped beneath a layer of warmer air, preventing pollutants from dispersing vertically. Agricultural burning, a common practice to clear fields for the next planting season, significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds that effectively flush out pollutants. Humidity levels rise, and the frequent downpours naturally cleanse the atmosphere. October and November mark a transitional period, with gradually decreasing rainfall and a return to more stable atmospheric conditions, potentially leading to a slight increase in pollution. Winter months (December-February) are generally the most favourable for outdoor activities. Cooler temperatures and occasional breezes help to disperse pollutants, although fog can occasionally form, trapping pollutants near ground level. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon season and be mindful of potential fog events in winter. Avoiding strenuous outdoor activity during peak pollution periods and wearing appropriate masks can mitigate exposure. Local authorities should prioritize monitoring and control of agricultural burning to minimize the impact on public health.