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Krishnarāyapuram, nestled in the Karur district of Tamil Nadu, India, occupies a relatively flat terrain at approximately 95 meters above sea level (coordinates 10.9563, 78.2782). This location places it within the fertile Kaveri River delta, a predominantly agricultural region. The city’s geography is defined by the alluvial plains formed by the Kaveri and its tributaries, supporting intensive cultivation of rice, sugarcane, and cotton. Krishnarāyapuram’s air quality is significantly influenced by this agricultural dominance; seasonal burning of crop residue after harvest is a major contributor to particulate matter. The surrounding landscape is characterized by a patchwork of agricultural fields, interspersed with small villages and pockets of vegetation along riverbanks. The urban-rural gradient is quite sharp, with Krishnarāyapuram serving as a market and service center for the surrounding rural communities. While not directly adjacent to major industrial belts, the broader Karur district is known for its textile industry, and transport emissions from goods movement to and from these centers contribute to localized pollution. The relatively low elevation and flat topography can also exacerbate pollution by limiting atmospheric dispersion, particularly during calm weather conditions. Proximity to the Kaveri provides some moisture, but doesn’t offer significant wind-driven pollutant removal.

Krishnarāyapuram experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The dry season, roughly from February to May, sees a build-up of dust and particulate matter due to drier conditions and increased agricultural activity preparing fields. Temperatures rise, potentially leading to temperature inversions that trap pollutants near the ground. March and April are typically the least favourable months for outdoor activity for those with respiratory sensitivities. The southwest monsoon arrives in June, bringing relief from the heat and washing away accumulated pollutants, resulting in improved air quality. However, increased humidity can also foster mold growth, impacting those with allergies. The monsoon season, lasting until September, generally offers the cleanest air. October and November mark a transitional period, with decreasing rainfall and a gradual increase in pollution as agricultural practices intensify again, including post-monsoon crop residue burning. This period can see a resurgence of particulate matter. The cooler, drier months of December and January offer relatively good air quality, though localized pollution from domestic fuel burning remains a concern. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should exercise caution during the dry season and periods of crop burning.