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Seltso, nestled within the Bryanskaya Oblast’ of Russia, occupies a geographically significant position at approximately 53.3678° N, 34.0978° E. The town’s location is characterized by a gently undulating terrain, part of the broader Central Russian Upland, with elevations ranging from 180 to 220 meters above sea level. This relatively low elevation, combined with the surrounding landscape of mixed deciduous and coniferous forests, influences local air circulation patterns. Seltso sits near the Desna River, a major tributary of the Dnieper, which provides a degree of moisture and can, under certain meteorological conditions, help disperse pollutants, though stagnant air can also trap them. The region is a transitional zone between agricultural lands and more extensive forest cover, with surrounding areas dedicated to crop cultivation and livestock farming. This agricultural activity contributes to potential sources of ammonia and particulate matter, particularly during planting and harvesting seasons. The urban–rural gradient around Seltso is gradual; the town itself is a relatively small settlement, and the immediate surroundings are predominantly rural, minimizing the impact of large-scale industrial zones directly within the town limits. However, the Oblast’ is part of a broader industrial belt, and transportation corridors carrying goods to and from larger industrial centers can contribute to transboundary air pollution. The prevailing westerly winds, common to this latitude, play a crucial role in the movement of pollutants, potentially bringing in contaminants from upwind regions. The soil composition, largely podzolic, also influences the deposition of airborne particles.

Seltso’s air quality experiences a distinct seasonal cycle heavily influenced by its continental climate. Winter, spanning roughly November to March, presents the most challenging period. Characterized by prolonged periods of cold temperatures and frequent temperature inversions – where a layer of warm air traps cooler air near the ground – pollutants become significantly concentrated. The lack of wind during these inversions exacerbates the problem, leading to a build-up of particulate matter and gaseous emissions from residential heating (primarily wood and coal) and limited industrial activity. Fog, common in winter, further reduces visibility and traps pollutants close to the ground. Spring (April-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing accumulated pollutants. Agricultural activities, however, introduce new sources of ammonia and dust. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting dispersion. However, occasional heatwaves can lead to stagnant air conditions. Autumn (September-October) sees a return to more challenging conditions as temperatures cool and the agricultural season winds down, releasing dust and emissions from harvest activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor exposure and monitoring local air quality reports. During the spring and autumn, periods of agricultural activity should be approached with similar caution. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, particularly during periods of elevated pollution.