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Zmiiv, nestled within the Kharkivska Oblast of Ukraine, occupies a geographically significant position in the eastern part of the country. Located at approximately 49.69°N, 36.36°E, the town sits on a gently undulating plain, characteristic of the broader Donbas region. Its elevation averages around 120 meters above sea level, contributing to relatively stable atmospheric conditions, though susceptible to temperature inversions during colder months. The surrounding landscape is predominantly agricultural, a patchwork of fertile fields used for grain and sunflower cultivation, a key feature of the regional economy. To the west, the Seversky Donets River, a major waterway in eastern Ukraine, exerts a localized influence on humidity and potential pollutant dispersal. Zmiiv’s urban character is that of a small industrial town, historically linked to the nearby Vorskla fuel enrichment plant, a significant employer and a potential source of localized air emissions. The urban–rural gradient is gradual; the town seamlessly blends into the agricultural landscape, with residential areas interspersed amongst fields. This proximity to agricultural zones means that seasonal burning practices, while traditionally employed, can contribute to particulate matter in the air. The town’s location within the broader Donbas industrial belt, though not directly adjacent to the largest industrial hubs like Kharkiv, still experiences some secondary impacts from regional pollution sources carried by prevailing winds. The relatively flat terrain limits vertical mixing, potentially trapping pollutants closer to the ground, especially during periods of calm weather.

Zmiiv’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological patterns. Spring (March-May) often brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural activities, including the burning of crop residues, can introduce significant particulate matter, particularly in April and May. Summer (June-August) generally sees the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, periods of intense heat can lead to stagnant air and ozone formation. Autumn (September-November) marks a concerning shift. As temperatures cool, the likelihood of temperature inversions increases, trapping pollutants near the ground. Agricultural burning continues, exacerbating the problem. Fog, common during autumn mornings, further concentrates pollutants. Winter (December-February) is typically the most challenging period. Cold, stable air masses, frequent temperature inversions, and limited wind speeds create conditions ripe for pollutant accumulation. Indoor heating, often reliant on solid fuels, contributes to particulate matter and carbon monoxide levels. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exposure during autumn and winter, particularly on days with fog or calm conditions. During spring, monitor for smoke from agricultural burning and adjust outdoor activities accordingly. Summer offers the most favourable conditions, but be mindful of ozone levels on hot days. Overall, a proactive approach to air quality awareness, including checking local forecasts and limiting strenuous outdoor activity during peak pollution periods, is recommended.