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Rajim, situated at 20.9667°N, 81.8833°E in Chhattisgarh's fertile plains, occupies a strategic position at the confluence of the Mahanadi, Pairi, and Sondur rivers, earning it the moniker 'Prayag of Chhattisgarh.' This small urban centre of 28,000 residents lies approximately 45 kilometres northeast of Raipur, the state capital, within India's rice bowl region, where intensive agriculture dominates the landscape. The terrain is predominantly flat, with an elevation around 290 metres above sea level, fostering stagnant air conditions that exacerbate pollution accumulation. Rajim's location in the Mahanadi River basin places it amidst extensive paddy fields, which contribute to agricultural residue burning, a significant pollution source. The city's urban-rural gradient is pronounced, with dense settlement clusters giving way to sprawling farmlands, yet vehicle exhaust and construction dust from ongoing development projects permeate the air. Proximity to National Highway 30 increases exposure to road dust and vehicular emissions, while the absence of major industrial belts nearby means localised sources like domestic biomass burning for cooking and heating are primary culprits. The surrounding water bodies, though providing some humidity, do little to disperse pollutants due to low wind speeds typical of the region, trapping particulate matter and creating a haze that blankets the area, particularly during cooler months.

Rajim's air quality follows a distinct seasonal rhythm shaped by its tropical wet-and-dry climate. During winter (November to February), pollution peaks as cold, stable air leads to temperature inversions that trap pollutants near the ground, compounded by agricultural residue burning post-harvest and increased domestic biomass burning for warmth. Fog and low wind speeds further hinder dispersion, making these months hazardous for outdoor activities, especially for sensitive groups like children, the elderly, and those with respiratory conditions who should limit exposure and use masks. The pre-monsoon summer (March to May) sees extreme heat that can elevate ground-level ozone, though occasional thunderstorms provide temporary cleansing, offering brief windows for outdoor pursuits in early mornings. The monsoon (June to September) brings relief as heavy rains wash away particulate matter, resulting in the cleanest air of the year, ideal for outdoor activities despite flooding risks. Post-monsoon (October) marks a transition, with rising pollution as burning resumes and meteorological conditions deteriorate. To minimise health risks, plan visits during the monsoon or early post-monsoon period, and avoid winter months when pollution concentrations are highest, adhering to local air quality advisories for real-time guidance.