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Rāyagada, nestled in the undulating landscapes of southern Odisha, India, occupies a unique geographic position. Situated at coordinates 19.1700°N, 83.4200°E, the city is cradled within the Eastern Ghats, a region characterised by heavily forested hills and deep valleys. The terrain is predominantly hilly, with an average elevation contributing to cooler temperatures compared to the coastal plains. Rāyagada isn’t directly on a major river, but is influenced by tributaries of the Godavari river system, impacting local humidity and potential for localised flooding during the monsoon. The surrounding landscape is a mosaic of dense sal forests, tribal villages practicing shifting cultivation, and pockets of agricultural land focused on rice and pulses. While not a major industrial hub, Rāyagada serves as a commercial centre for the surrounding agricultural region, with some small-scale rice mills and processing units. The urban-rural gradient is steep; the city centre quickly transitions to rural landscapes dominated by agriculture and forest cover. This proximity to agricultural practices, including seasonal burning of crop residue, and the hilly terrain which can trap pollutants, significantly influences local air quality. Dust from unpaved roads and construction also contributes to particulate matter levels, particularly during the drier months. The city’s location within a valley can exacerbate pollution events by limiting air dispersion.

Rāyagada’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon conditions. The monsoon season, typically from June to September, generally brings improved air quality due to rainfall washing away pollutants and suppressing dust. However, increased humidity can also foster mould growth, potentially impacting respiratory health. October and November see a gradual decline in air quality as the monsoon retreats and agricultural burning intensifies, preparing fields for the Rabi crop. This period often experiences stagnant air conditions, trapping smoke and particulate matter in the valleys. December to February are the driest months, and typically the worst for air quality. Lower temperatures lead to temperature inversions, where a layer of cool air traps pollutants near the ground. Dust from construction and unpaved roads further exacerbates the problem. March to May witness rising temperatures and pre-monsoon winds, offering some relief, but can also stir up dust. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the post-monsoon (October-November) and winter (December-February) months. Wearing masks and avoiding peak traffic hours are recommended. Monitoring local conditions and heeding health advisories is crucial.