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Sankaranayinār Kovil, nestled in the Thanjavur district of Tamil Nadu, India, occupies a relatively flat, low-lying terrain characteristic of the Cauvery Delta region. Situated at coordinates 9.1600°N, 77.5500°E, the city’s geography is profoundly shaped by its proximity to the Kollidam River, a major distributary of the Cauvery. This fluvial landscape contributes to high humidity and influences local wind patterns. The surrounding area is predominantly agricultural, dominated by intensive rice cultivation, a practice that, while vital to the regional economy, introduces seasonal biomass burning and associated particulate matter into the atmosphere. The urban-rural gradient is fairly sharp; Sankaranayinār Kovil functions as a regional service centre for numerous smaller villages engaged in agriculture. While not a major industrial hub itself, the city’s connectivity to larger industrial zones further inland, particularly those related to textiles and manufacturing, means it can experience pollutant transport. The relatively low elevation and the frequent occurrence of temperature inversions, especially during calmer periods, exacerbate the trapping of pollutants near the ground. The deltaic environment also means potential for saline intrusion impacting vegetation and potentially contributing to aerosol formation. Understanding this interplay of factors is crucial for assessing and mitigating air quality challenges.

Sankaranayinār Kovil experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The northeast monsoon, arriving between October and December, brings heavy rainfall which temporarily washes pollutants from the air, resulting in generally improved conditions during these months. However, increased humidity can also foster mould growth, impacting respiratory health. The hottest months, March to May, see a build-up of pollutants due to stable atmospheric conditions and increased vehicle activity. Dry conditions also encourage dust resuspension from agricultural fields. Post-monsoon, from January to February, can experience stagnant air and temperature inversions, trapping pollutants. The southwest monsoon, though less impactful than the northeast, brings some relief in June-September. Biomass burning from agricultural residue disposal after the harvest season, particularly in November-December, is a significant contributor to particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the hot, dry season and periods of agricultural burning. Monitoring wind direction is key; pollutants often drift from upwind agricultural areas. Avoiding strenuous activity during peak pollution times is advisable.