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Cherdakly, nestled within the Ul’yanovskaya Oblast’ of Russia, occupies a geographically significant position on the southeastern edge of the Volga Upland. Its coordinates (54.3591, 48.8487) place it amidst a gently rolling terrain, characterized by loessial soils and a mix of deciduous forests and agricultural land. The city sits approximately 150 meters above sea level, contributing to localized temperature variations and influencing atmospheric stability. Cherdakly’s proximity to the Volga River, though not directly on its banks, is crucial; the river acts as a regional climate regulator, moderating temperatures and influencing wind patterns. The surrounding landscape is predominantly rural, a patchwork of fields used for grain and livestock farming, interspersed with small villages and woodlands. This urban–rural gradient means agricultural practices, including fertilizer use and seasonal burning, can contribute to localized air pollution episodes. To the west, the Volga Upland gradually rises, potentially trapping pollutants under stable atmospheric conditions. The region’s industrial base is relatively light, primarily focused on food processing and small-scale manufacturing, but transportation corridors connecting the Volga River to inland Russia pass nearby, introducing vehicle emissions. The city’s compact urban form, with a central core and radiating residential areas, means that pollution sources, though limited, can have a disproportionate impact on local air quality. The prevailing winds, generally from the west, carry pollutants eastward, impacting downwind communities and potentially affecting the river’s ecosystem.

Cherdakly’s air quality follows a distinct seasonal pattern dictated by its continental climate. Winters (December-February) are typically the most challenging, characterized by prolonged periods of temperature inversion. Cold, dense air settles in the valleys and low-lying areas, trapping pollutants released from residential heating (primarily wood and coal) and limited industrial activity. Fog, common during these months, exacerbates the problem by reducing atmospheric mixing and further concentrating particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants. However, agricultural activities, including the application of fertilizers and occasional field burning, can trigger localized spikes in ammonia and particulate matter. Summer (June-August) generally offers the best air quality, with warm temperatures, frequent convective mixing, and relatively low agricultural activity. However, periods of stagnant high pressure can still lead to ozone formation. Autumn (September-November) sees a return to more variable conditions. Cooler temperatures and decreasing sunlight hours can lead to temperature inversions, while agricultural harvesting activities contribute to dust and particulate pollution. The months of November and December are particularly susceptible to poor air quality due to the combination of cold temperatures, temperature inversions, and increased residential heating. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods, especially on days with low visibility or a noticeable odour. Maintaining indoor air quality through ventilation and air purification can also be beneficial.