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Kannānkurichchi, nestled in the Virudhunagar district of Tamil Nadu, India, occupies a geographically significant position within the southern Indian landscape. Located at approximately 11.6969° N latitude and 78.1794° E longitude, the town sits on a gently undulating terrain, characteristic of the Deccan Plateau's fringes. The surrounding landscape is predominantly agricultural, with extensive fields of rice, sugarcane, and pulses defining the rural character extending outwards. This proximity to intensive agricultural practices contributes to localized air quality concerns, particularly related to biomass burning during harvest seasons. The elevation is relatively modest, averaging around 120 meters above sea level, which can influence the dispersion of pollutants, often leading to stagnation during periods of low wind speed. While not directly adjacent to major rivers, Kannānkurichchi benefits from groundwater resources, supporting irrigation and local water needs. The town’s urban footprint is small, representing a clear urban–rural gradient, with the built environment largely confined to the town center and radiating outwards along major roadways. The regional position, within a densely populated agricultural belt, means that Kannānkurichchi is susceptible to transboundary pollution events originating from larger industrial centers further north and west. The lack of significant topographic barriers exacerbates this vulnerability, allowing pollutants to spread relatively easily across the region. The climate is tropical, with hot and humid conditions prevailing for much of the year, impacting atmospheric stability and pollutant behaviour.

Kannānkurichchi’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical monsoon climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. High temperatures and minimal rainfall create stable atmospheric conditions, frequently leading to temperature inversions that trap pollutants near the ground. Agricultural burning, a common practice for clearing fields after harvest, significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing accumulated pollutants. However, heavy rainfall can also lead to increased humidity and the formation of ground-level ozone under specific conditions. The post-monsoon season (October-November) sees a gradual return to drier conditions, with a resurgence of agricultural burning, though often less intense than in the pre-monsoon period. Winter months (December-February) are generally the most favourable for outdoor activities, with cooler temperatures and more frequent wind patterns aiding in pollutant dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon months, limiting prolonged outdoor exposure and avoiding areas with visible smoke. Maintaining indoor air quality through ventilation and air purification can also be beneficial. Public awareness campaigns promoting responsible agricultural practices and reducing biomass burning are crucial for mitigating seasonal air quality fluctuations and safeguarding public health. The interplay of wind patterns, temperature, and agricultural activities shapes the air quality narrative throughout the year.