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Vallikunnam, nestled in the Alappuzha district of Kerala, India, occupies a geographically significant position within the state's coastal belt. Located at approximately 9.1167° N latitude and 76.5333° E longitude, the town’s terrain is predominantly flat, characteristic of the Kerala plains, with gentle undulations reflecting the region’s alluvial soil composition. The proximity to the Arabian Sea, roughly 10 kilometers to the west, exerts a considerable influence on the local climate and, consequently, air quality. Vallikunnam sits within a predominantly rural landscape, transitioning gradually towards a more urban character as it connects to larger towns and cities within Alappuzha. The surrounding area is a mosaic of paddy fields, coconut groves, and small-scale agricultural plots, typical of Kerala’s agrarian economy. While Vallikunnam itself is not a major industrial hub, it benefits from its connectivity to industrial zones further inland, particularly those associated with rubber processing and coir production, which can contribute to localized air pollution. The urban–rural gradient is relatively smooth, with small settlements and agricultural land interspersed throughout the region. Elevation is minimal, rarely exceeding 20 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The backwaters, a defining feature of Kerala’s geography, are also nearby, influencing humidity and potentially affecting the dispersion of airborne particles. The flat topography and coastal location combine to create a unique microclimate that impacts the behaviour of pollutants.

Vallikunnam’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The southwest monsoon, typically spanning from June to September, brings torrential rainfall, effectively cleansing the atmosphere and significantly reducing particulate matter and gaseous pollutants. This period generally offers the best air quality for outdoor activities. Conversely, the pre-monsoon months (March-May) often experience a build-up of pollutants due to stagnant air and increased temperatures. The lack of rainfall allows for the accumulation of emissions from agricultural practices (crop burning, fertilizer use), vehicular traffic, and any localized industrial activity. Temperature inversions, common during these months, trap pollutants near the ground, worsening air quality. The post-monsoon season (October-November) sees a gradual improvement as rainfall returns, but lingering humidity can still trap pollutants. Fog, particularly in the cooler months (December-January), can also contribute to reduced visibility and increased concentrations of fine particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon months and avoid prolonged outdoor exposure during periods of fog. Agricultural workers should be mindful of potential exposure to pesticides and fertilizers. Maintaining indoor air quality through ventilation and air purifiers is advisable during periods of elevated pollution. The monsoon provides a natural respite, but even then, localized sources of pollution can still impact air quality in specific areas of Vallikunnam.