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Vikravāndi, nestled in the Virudhunagar district of Tamil Nadu, India, occupies a geographically significant position within the southern Deccan Plateau. Located at approximately 12.0369° N latitude and 79.5460° E longitude, the town sits at a modest elevation of around 130 meters (427 feet) above sea level. The surrounding landscape is predominantly characterized by undulating plains and gently sloping hills, typical of the rain shadow region of the Western Ghats. This location influences Vikravāndi’s climate and, consequently, its air quality. The town is not directly adjacent to any major river or lake, though groundwater resources are present, impacting local agricultural practices. The region is largely agrarian, with significant cultivation of sugarcane, cotton, and pulses, contributing to potential particulate matter emissions from agricultural burning, particularly during harvest seasons. While Vikravāndi itself is a relatively small urban center with a population of approximately 13,391, it lies within a broader agricultural belt and experiences a gradual urban–rural gradient. Larger industrial zones are situated further afield, primarily in Coimbatore and Madurai, but transportation corridors connecting these industrial hubs pass near Vikravāndi, potentially introducing pollutants from vehicular traffic. The terrain, with its gentle slopes, can sometimes trap pollutants, especially during periods of low wind speed, exacerbating localized air quality issues. The rain shadow effect also limits rainfall, which naturally helps to cleanse the atmosphere, making Vikravāndi more susceptible to pollutant accumulation.

Vikravāndi’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and monsoon cycles. The dominant influence is the southwest monsoon (June to September), bringing substantial rainfall and a temporary reduction in particulate matter concentrations as precipitation washes pollutants from the atmosphere. However, the monsoon season can also introduce humidity, which can trap certain gaseous pollutants. The pre-monsoon season (March to May) typically witnesses a rise in air quality concerns. High temperatures and decreasing rainfall create stable atmospheric conditions, often leading to temperature inversions, where a layer of warm air traps cooler air and pollutants near the ground. Agricultural burning, prevalent during this period as farmers clear fields for the next planting season, significantly contributes to particulate pollution. The post-monsoon season (October to November) is generally characterized by calmer winds and cooler temperatures, which can again lead to pollutant accumulation. Fog, common during these months, further restricts atmospheric dispersion. Winter (December to February) offers a slight respite, with cooler temperatures and occasional wind shifts that help to ventilate the area. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor exertion and monitoring for any respiratory discomfort. Maintaining indoor air quality through ventilation and air purification can also be beneficial during periods of elevated pollution.