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Marks, nestled within the Saratovskaya Oblast’ of Russia, occupies a geographically significant position at the edge of the Volga Upland. Its coordinates (51.7167, 46.7500) place it in a relatively flat terrain, though gently undulating towards the east, characteristic of the broader region. The city’s location is approximately 100 kilometers north of the Volga River, Russia’s longest river, influencing local climate patterns and potentially impacting air mass movement. The surrounding landscape is predominantly agricultural, with vast fields of wheat and sunflowers dominating the horizon – a typical feature of the fertile Volga region. This proximity to intensive agricultural practices introduces potential sources of particulate matter, particularly during planting and harvesting seasons, as well as ammonia emissions from fertilizer use. To the west, the terrain gradually rises, contributing to localized drainage patterns. The urban–rural gradient around Marks is relatively sharp; the city transitions quickly into agricultural land, with scattered villages and rural settlements. While Marks isn't situated directly within a major industrial belt, it serves as a regional hub for agricultural processing and light manufacturing, which can contribute to localized air pollution. The elevation of Marks, around 180 meters above sea level, doesn't significantly impact air quality directly, but it does influence temperature inversions, particularly during colder months, potentially trapping pollutants closer to the ground. The lack of significant topographic barriers allows for relatively free air movement, but also means pollutants can be transported from further afield.

Marks experiences a continental climate, profoundly shaping its air quality throughout the year. Winters (December-February) are typically the most challenging period. Cold temperatures frequently lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Fog, common during these months, exacerbates the issue by reducing visibility and further hindering dispersion. Agricultural burning, though regulated, can still occur, adding to particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated pollutants. However, the agricultural season begins, introducing dust from tilling and planting, alongside ammonia emissions. Summer (June-August) generally offers the best air quality, with warmer temperatures promoting atmospheric mixing and frequent rainfall helping to cleanse the air. However, occasional heatwaves can lead to stagnant air conditions. Autumn (September-November) sees a return to more variable conditions. Harvest activities contribute to dust and smoke, while cooler temperatures can trigger localized inversions. The months of November and December are particularly prone to poor air quality due to the combination of cold temperatures, inversions, and agricultural residue burning. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods, especially on days with visible haze or fog. During the warmer months, outdoor activities are generally safer, but it's advisable to monitor local conditions and avoid strenuous exercise during heatwaves.