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Rājnagar, Madhya Pradesh, nestled within the fertile plains of central India, presents a unique geographic profile influencing its air quality. Situated at approximately 24.8893° N, 79.9118° E and a modest elevation of around 275 meters above sea level, the city’s location is characterized by a gently undulating terrain typical of the Indo-Gangetic Plain. The surrounding landscape is predominantly agricultural, with extensive fields of wheat, soybean, and pulses dominating the rural areas. This proximity to intensive agricultural practices contributes to seasonal particulate matter, particularly during harvest periods when residue burning is common. Rājnagar’s position within Madhya Pradesh places it relatively far from major industrial hubs, though it benefits from connectivity to regional transport networks, which can introduce vehicular emissions. The Betwa River flows nearby, offering some localized humidity and potential for precipitation, which can help cleanse the air, but also contributes to fog formation during cooler months. The urban–rural gradient is relatively gradual, with smaller villages and agricultural land seamlessly blending into the city’s periphery. The lack of significant topographic barriers means that pollutants tend to disperse horizontally rather than being trapped, although temperature inversions, common during winter, can significantly alter this pattern. The regional climate, characterized by hot summers and cool winters, further shapes the city’s air quality dynamics, impacting pollutant dispersion and chemical reactions.

Rājnagar’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The pre-monsoon season (March-May) typically witnesses a rise in pollution levels due to increased agricultural activity, including crop residue burning, and rising temperatures which exacerbate ground-level ozone formation. Dust storms, common during this period, further contribute to particulate matter. The monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, humidity increases, which can exacerbate respiratory issues for some. Post-monsoon (October-November) sees a return to elevated pollution levels as agricultural practices resume and cooler temperatures lead to stagnant air and increased fog. This period is often characterized by temperature inversions, trapping pollutants near the ground. Winter (December-February) is generally the most challenging period for air quality, with cold, calm conditions and frequent fog episodes. The lack of wind and the presence of moisture create ideal conditions for pollutant accumulation. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor activity during these periods, particularly during early morning and late evening hours when fog is prevalent. During the hotter months, staying hydrated and avoiding strenuous outdoor activity during peak sunlight hours is advisable. The interplay of these meteorological factors creates a dynamic air quality profile throughout the year, demanding adaptive strategies for public health.