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Kostroma, situated at the confluence of the Volga and Kostroma Rivers in European Russia's Kostromskaya Oblast', occupies a strategic position within the Central Federal District's northeastern periphery. The city's geography is defined by the vast East European Plain, with elevations averaging just 110 meters above sea level, creating a gently undulating terrain of mixed forests and agricultural fields that transition into the city's urban core. Kostroma's location along the Volga River—Europe's longest river—places it within Russia's historic 'Golden Ring' of ancient towns, yet its air quality is influenced by both its riverine setting and regional development patterns. The surrounding landscape consists primarily of boreal forests (taiga) to the north and agricultural zones to the south, with the city itself exhibiting a clear urban–rural gradient from its historic center outward. Proximity to the Volga provides some atmospheric ventilation, but the river valley can also trap pollutants under certain meteorological conditions. While not part of a major industrial belt like the Urals, Kostroma hosts general urban pollution sources including vehicle emissions, residential heating, and small-scale manufacturing. The city's position away from coastal influences means continental air masses dominate, with limited marine air to disperse pollutants. The flat terrain offers little topographic forcing for wind patterns, potentially allowing stagnation episodes when regional winds are calm.

Kostroma's air quality follows distinct seasonal patterns shaped by its continental climate. Winter (December-February) brings the most challenging conditions, as temperature inversions frequently trap pollutants near the surface, exacerbated by increased emissions from residential heating systems burning wood, coal, and natural gas. Cold, stagnant air masses from Siberia can linger for days, creating persistent pollution episodes. Sensitive groups should limit prolonged outdoor exposure during these inversion periods, particularly on windless mornings. Spring (March-May) sees gradual improvement as increasing solar radiation breaks up inversions and precipitation helps cleanse the atmosphere, though March can still experience winter-like stagnation. Summer (June-August) offers the cleanest air, with stronger vertical mixing, frequent rainfall, and vegetation actively filtering pollutants—ideal for outdoor activities. However, occasional forest fire smoke from distant regions can drift into the area. Autumn (September-November) begins with relatively good conditions in September but deteriorates as heating season resumes and temperature inversions become more frequent by late October. The transition months of April and September typically provide the most favorable balance of clean air and comfortable temperatures for outdoor pursuits. Wind patterns show no monsoon influence but feature variable directions, with northerly winds generally bringing cleaner air from forested regions while southerly winds may transport agricultural or urban emissions.