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Rajnandgaon is strategically positioned in the central-eastern region of Chhattisgarh, India, nestled within the fertile plains of the Mahanadi River basin at an elevation of approximately 307 meters above sea level. This urban centre serves as a crucial administrative and commercial hub for the surrounding rural hinterlands, characterised by a distinct urban-rural gradient where the compact city core transitions into extensive agricultural zones and scattered small-scale industrial clusters. The city's geography is dominated by flat to gently undulating terrain, with the Seonath River flowing nearby, though its limited water bodies provide minimal natural air cleansing effects. Rajnandgaon lies within the broader 'Rice Bowl of India' region, surrounded by vast paddy fields that significantly influence local air quality through agricultural practices. Its location in the Chhattisgarh Plains, part of the Deccan Plateau, creates a semi-enclosed topographical setting that can trap pollutants, particularly during cooler months when temperature inversions form. The city's position along major transportation corridors connecting industrial centres like Raipur and Bhilai exacerbates vehicle emissions, while its proximity to mineral-rich zones fosters small-scale industries that contribute to particulate matter pollution. This geographical context creates a complex air quality dynamic where urban emissions blend with rural agricultural and industrial sources across a relatively flat landscape with limited natural ventilation pathways.

Rajnandgaon's air quality follows a pronounced seasonal rhythm shaped by its tropical wet-and-dry climate. During winter (November-February), pollution peaks dramatically as cool, stable atmospheric conditions create frequent temperature inversions that trap pollutants near the surface. These months coincide with post-harvest agricultural residue burning in surrounding rice fields and increased construction activity during the dry season, compounding emissions from persistent vehicle exhaust and industrial sources. Sensitive groups should avoid prolonged outdoor exposure during these months, particularly in mornings when fog mixes with pollutants. The pre-monsoon period (March-May) brings extreme heat that photochemically transforms emissions into secondary pollutants, though occasional thunderstorms provide temporary cleansing. The southwest monsoon (June-September) offers the cleanest air as heavy rains wash away particulate matter and strong winds disperse pollutants, making this the optimal period for outdoor activities. Post-monsoon (October) sees a rapid deterioration as rains cease but agricultural burning begins, creating a hazardous transition period. Throughout the year, road dust remains a constant concern due to the city's dry conditions and unpaved peripheries. Health guidance emphasizes that asthma patients and elderly residents should monitor symptoms particularly during winter inversions and pre-monsoon heatwaves, while all residents benefit from indoor air filtration during peak pollution months.