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Rupsa, a municipality in Odisha, India, occupies a relatively low-lying coastal plain at approximately 21.6167°N, 87.0167°E. Its geography is fundamentally shaped by its proximity to the Bay of Bengal, influencing humidity and wind patterns. The terrain is largely flat, characteristic of the coastal alluvial plains formed by the Mahanadi River delta. Rupsa’s urban character is evolving, transitioning from a primarily agricultural and fishing-based economy to include small-scale industrial activity and services catering to the nearby port city of Paradip. This transition is a key factor in understanding its air quality challenges. The surrounding landscape is dominated by rice paddies, cashew plantations, and mangrove forests, interspersed with human settlements. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the municipal limits. The proximity to Paradip, a major industrial port, introduces potential sources of particulate matter and gaseous pollutants transported by prevailing winds. The coastal location also means susceptibility to sea breezes which can either disperse or concentrate pollutants depending on atmospheric conditions. Understanding these geographical factors is crucial for effective air quality management in Rupsa.

Rupsa experiences a distinct tropical climate with pronounced wet and dry seasons, heavily influencing air quality. The post-monsoon season (October-November) often sees a temporary improvement in air quality due to rainfall washing away accumulated pollutants, but stagnant air and temperature inversions can quickly trap emissions. The dry season (December-April) is typically the period of poorest air quality. Lower humidity and increased wind speeds can stir up dust from agricultural lands and construction sites. February and March are particularly challenging, with dry conditions and stable atmospheric layers. The pre-monsoon season (May-June) brings rising temperatures and increased convective activity, offering some dispersion, but also potential for localized dust storms. The monsoon season (July-September) generally provides the cleanest air, as heavy rainfall effectively scrubs the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly February-March. Monitoring wind direction is vital, as pollutants from Paradip can significantly impact Rupsa’s air quality.