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Bilhorod-Dnistrovskyi, nestled within the Odeska Oblast of southwestern Ukraine, occupies a strategically significant position where the Dnistro River meets the Black Sea. Its coordinates (46.1833, 30.3500) place it within a coastal plain characterized by gently rolling hills and fertile steppe lands. The city’s urban fabric is a blend of historical architecture, reflecting its long and complex history as a trading port, and more modern residential areas. The Dnistro River, a major waterway, plays a crucial role in the city’s geography, influencing local climate patterns and providing a natural boundary. The surrounding landscape is predominantly agricultural, with extensive fields of grains and sunflowers stretching inland, contributing to seasonal dust and pollen loads. To the east, the terrain gradually rises, while to the west, it flattens towards the Black Sea coastline. The proximity to the Black Sea introduces a maritime influence, moderating temperatures and occasionally bringing in sea salt and moisture. While Bilhorod-Dnistrovskyi isn't situated directly within a major industrial belt, its port activity and connection to regional agricultural production mean that transportation-related emissions and agricultural practices can impact local air quality. The urban-rural gradient is relatively smooth, with smaller villages and agricultural areas blending seamlessly into the city's periphery, potentially leading to diffuse pollution sources affecting the broader area. Elevation is relatively low, averaging around 30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions.

Bilhorod-Dnistrovskyi’s air quality experiences a distinct seasonal cycle heavily influenced by its climate and surrounding environment. Spring (March-May) often sees elevated pollen levels from the surrounding agricultural fields, particularly from sunflowers and wheat, impacting those with allergies. Dust storms, carried by winds from the steppe, can also contribute to poorer air quality during this period. Summer (June-August) generally brings cleaner air due to increased convective mixing – warmer temperatures and sunlight promote vertical air movement, dispersing pollutants. However, periods of intense heat can lead to stagnant air and ozone formation. Autumn (September-November) marks a transition period, with a gradual increase in particulate matter as agricultural activities resume, including harvesting and field preparation. Temperature inversions, common during clear autumn nights, can trap pollutants near the ground, leading to localized air quality degradation. Winter (December-February) often presents the most challenging conditions. Cold, stable air masses combined with frequent fog, a consequence of the Black Sea’s moisture, can significantly reduce air dispersion. While industrial activity may decrease, residential heating, often reliant on less efficient fuels, contributes to localized pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of fog and temperature inversions, particularly in the mornings. Maintaining indoor air quality through ventilation and air purification can also be beneficial throughout the year, but especially during the colder months.