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Tāzhakudi, nestled in the Thanjavur district of Tamil Nadu, India (8.2348° N, 77.4533° E), occupies a geographically significant position within the Kaveri Delta, a fertile and densely populated region. The city’s terrain is predominantly flat, characteristic of deltaic landscapes, with elevations rarely exceeding 15 meters above sea level. This low elevation, coupled with its proximity to the Kaveri River and numerous irrigation canals, contributes to a humid subtropical climate and a high water table. The surrounding landscape is dominated by intensive agricultural land, primarily rice paddies and sugarcane fields, interspersed with smaller villages and pockets of coconut groves. Tāzhakudi’s urban character is that of a small, developing town, exhibiting a gradual urban–rural gradient as one moves outwards. While the core area displays denser residential and commercial activity, the periphery quickly transitions into agricultural zones. The region’s industrial activity is relatively limited, with small-scale agro-processing units and brick kilns being the most prevalent. However, the proximity to larger industrial belts in nearby cities like Thanjavur and Kumbakonam can influence air quality through transported pollutants. The flat topography and prevailing wind patterns often lead to stagnant air conditions, particularly during certain times of the year, hindering the dispersion of pollutants emitted from both local and regional sources. The delta's unique geography, therefore, presents both opportunities and challenges for maintaining clean air, requiring careful management of agricultural practices and industrial emissions.

Tāzhakudi’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and monsoon cycles. The period from March to May, corresponding to the pre-monsoon season, typically witnesses the poorest air quality. High temperatures and reduced rainfall create stable atmospheric conditions, often leading to temperature inversions where cooler air is trapped beneath a layer of warmer air, preventing vertical mixing and trapping pollutants near the ground. Agricultural burning, a common practice for clearing fields after the harvest, significantly contributes to particulate matter pollution during this period. The monsoon season, from June to September, brings relief as strong winds and frequent rainfall effectively flush out pollutants, resulting in improved air quality. October and November mark a transitional period with gradually decreasing temperatures and increasing humidity. December and January, the cooler months, can experience periods of fog, particularly in the mornings, which can trap pollutants and temporarily reduce visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon season, limiting outdoor activities during peak pollution hours. Agricultural workers are particularly vulnerable and should utilize appropriate respiratory protection. Maintaining indoor air quality through ventilation and air purifiers can also provide some respite. The monsoon months generally offer the most favourable conditions for outdoor activities, although pollen levels can be elevated during certain periods. Awareness campaigns promoting cleaner agricultural practices and responsible waste management are crucial for mitigating air pollution throughout the year.