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Rostov-on-Don, the administrative center of Rostovskaya Oblast', occupies a strategic position in southwestern Russia where the Don River meets the Sea of Azov, approximately 46 kilometers from the sea itself. Situated at a modest elevation of around 70 meters above sea level, the city lies within the vast East European Plain, characterized by gently rolling steppe terrain that extends in all directions. This flat topography significantly influences air quality by limiting natural ventilation; pollutants tend to accumulate rather than disperse, especially during periods of calm winds. The urban area straddles both banks of the Don River, with the historic center on the right bank and industrial zones predominantly on the left, creating a distinct urban-rural gradient as one moves away from the river into agricultural steppes. Rostov serves as the economic hub of Russia's Southern Federal District, surrounded by intensive agricultural regions known for grain production, which contributes seasonal particulate matter from farming activities. The city's location within the Donets Basin industrial region, though not as heavily industrialized as nearby areas like Donetsk, means it experiences pollution from general urban sources including transportation, residential heating, and some manufacturing. Proximity to the Sea of Azov introduces maritime influences that can occasionally bring cleaner air masses, but also humidity that may exacerbate pollution formation. The urban fabric, with its mix of Soviet-era infrastructure and modern developments, creates microclimates that affect local air circulation patterns.

In Rostov-on-Don, air quality follows a distinct seasonal pattern shaped by the continental climate with maritime influences from the nearby Sea of Azov. Winter months, particularly December through February, typically see the poorest air quality due to increased emissions from residential heating systems burning coal and natural gas, combined with frequent temperature inversions that trap pollutants close to the ground. Cold, stagnant air masses create hazardous conditions for sensitive groups like asthmatics and the elderly, who should limit outdoor activities during these months. Spring brings gradual improvement as temperatures rise and precipitation increases, with March and April experiencing better ventilation though occasional dust storms from the surrounding steppes can temporarily degrade air quality. Summer offers the most favorable conditions for outdoor activities, with June through August benefiting from stronger winds, convective mixing, and reduced heating emissions, though occasional heat waves in July and August can lead to ozone formation. Autumn sees a gradual deterioration as temperatures drop and heating systems restart, with October and November marking the transition to winter pollution patterns. Throughout the year, wind patterns play a crucial role—northeasterly winds from the steppes can bring cleaner air, while southerly winds from industrial areas may carry pollutants. Fog, particularly common in late autumn and winter, can combine with pollution to create smog episodes. Sensitive individuals should monitor local air quality reports and plan outdoor activities for late spring through early autumn when conditions are generally most favorable.