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Smila, nestled within the Cherkaska Oblast of central Ukraine, occupies a geographically significant position within the broader Dnipro River basin. Located at approximately 49.23°N, 31.88°E, the city sits on a gently undulating plain, characterized by loessial soils – a legacy of glacial activity and wind deposition – which can influence dust suspension and particulate matter. Its elevation, around 138 meters above sea level, contributes to localized temperature inversions, particularly during colder months, trapping pollutants closer to the ground. The surrounding landscape is predominantly agricultural, a patchwork of fertile fields used for grain and sunflower cultivation, interspersed with pockets of deciduous forest. This agricultural activity, while vital to the regional economy, introduces potential sources of ammonia and particulate matter from fertilizer application and soil erosion. Smila’s proximity to the larger industrial belt centered around Kropyvnytskyi, roughly 60 kilometers to the southeast, means it can experience downwind transport of industrial pollutants. The urban–rural gradient is relatively gradual, with smaller villages and agricultural land seamlessly blending into the city’s periphery. The lack of major waterways directly adjacent to Smila limits natural air cleansing mechanisms like precipitation washing and wind-driven dispersion, making the city’s air quality more susceptible to local emissions and regional transport patterns. The terrain, while not mountainous, creates microclimates that can exacerbate pollution accumulation in certain areas.

Smila’s air quality exhibits a distinct seasonal pattern dictated by meteorological conditions and agricultural practices. Spring (March-May) often sees elevated particulate matter levels due to the combination of agricultural activities – plowing, fertilizer spreading, and the initial stages of crop growth – releasing dust and ammonia into the atmosphere. Temperature inversions are still common during this period, hindering pollutant dispersal. Summer (June-August) generally offers the best air quality, with warmer temperatures promoting atmospheric mixing and increased wind speeds, effectively ventilating the city. However, periods of intense heat can lead to ground-level ozone formation, a secondary pollutant. Autumn (September-November) brings a resurgence of particulate matter, linked to harvest activities and the increased use of biomass burning for agricultural waste management. Fog, frequently occurring in October and November, traps pollutants near the surface, creating stagnant air conditions. Winter (December-February) is typically the most challenging season. Cold temperatures and frequent temperature inversions lead to prolonged periods of poor air quality, with pollutants accumulating near the ground. The use of coal and wood for heating in residential areas further contributes to particulate and carbon monoxide pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during periods of fog and temperature inversions, particularly in the autumn and winter months. Avoiding strenuous exercise during these times is also advisable. Maintaining indoor air quality through ventilation and air purification can offer some protection.