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Horki, nestled within the Mahilyowskaya Voblasts’ of Belarus, occupies a geographically significant position within the Polesian Lowland, a vast, flat expanse characterized by its rich, dark-hued soils and extensive wetlands. Located at approximately 54.2667° N, 30.9833° E, the city’s terrain is predominantly level, averaging around 145 meters above sea level, contributing to a tendency for pollutants to linger, particularly during periods of atmospheric stability. The surrounding landscape is a mosaic of agricultural fields – primarily grain and potato cultivation – interspersed with remnants of the ancient Polesian forests, now largely fragmented. The Neman River, though not directly adjacent to Horki, influences the regional climate and hydrological patterns, impacting local humidity and potential for fog formation. Horki’s position within a predominantly agricultural zone means that seasonal agricultural practices, such as fertilizer application and harvesting, can contribute to localized air pollution episodes. The urban–rural gradient is relatively gradual; the city blends seamlessly into the surrounding agricultural landscape, with smaller villages and rural settlements dotting the immediate periphery. While Horki isn't situated directly within a major industrial belt, it serves as a regional service center, and transportation corridors passing through the area can introduce pollutants from vehicular traffic. The flatness of the terrain, combined with the prevalence of agricultural activity and the lack of significant topographical barriers, creates a setting where air quality is susceptible to both local and regional influences, demanding careful monitoring and mitigation strategies.

Horki’s air quality experiences a distinct seasonal cycle heavily influenced by Belarus’s continental climate. Spring (March-May) often brings a period of increased particulate matter due to agricultural activities – soil tilling and fertilizer application release dust and ammonia into the atmosphere. The warming temperatures also encourage the release of volatile organic compounds (VOCs) from vegetation. Summer (June-August) generally sees improved air quality, with higher temperatures and increased convective mixing dispersing pollutants. However, periods of stagnant high-pressure systems can lead to localized heat island effects and trapping of pollutants. Autumn (September-November) presents a complex picture. Harvesting activities resume, contributing to particulate pollution, while cooler temperatures and increased fog frequency can trap pollutants near the ground. The most concerning period is often late autumn and early winter (November-February), when temperature inversions are common. Cold air becomes trapped beneath a layer of warmer air, preventing vertical mixing and allowing pollutants to accumulate. Fog, a frequent occurrence during these months, further exacerbates the problem by absorbing pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of fog and temperature inversions. During the warmer months, while generally better, prolonged exposure to direct sunlight can still increase ground-level ozone, so midday activity should be tempered. Agricultural workers and residents living near fields should take precautions during planting and harvesting seasons, such as wearing masks and avoiding prolonged exposure.