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Starokostiantyniv, nestled within the Khmelnytska Oblast of Ukraine, occupies a geographically significant position in the Podillia region, characterized by undulating plains and a history deeply intertwined with agricultural practices. Located at approximately 49.7556° N, 27.2208° E, the city sits at an elevation of roughly 210 meters (689 feet) above sea level, contributing to a relatively moderate climate. The surrounding landscape is predominantly agricultural, a patchwork of fields cultivated with grains, sunflowers, and sugar beets – a crucial element in the regional economy. This proximity to intensive farming introduces potential sources of particulate matter, particularly during harvest seasons when soil disturbance and agricultural burning (though officially restricted, it can still occur) can elevate air quality concerns. To the west, the Southern Bug River flows, offering a degree of moisture and influencing local weather patterns, though its impact on air quality is generally limited. The urban–rural gradient around Starokostiantyniv is gradual, with smaller villages and agricultural land seamlessly blending into the city's periphery. While not situated directly within a major industrial belt, the city’s connection to regional transportation networks means it can be affected by transboundary pollution. The terrain, being gently rolling, can sometimes trap pollutants, especially during periods of calm weather, hindering dispersion and leading to localized air quality degradation. The city’s relatively small size (population 33,921) means that localized industrial emissions, while present, are not as significant as in larger urban centers, but agricultural practices remain a key factor.

Starokostiantyniv’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions and agricultural activities. Spring (March-May) often brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, the start of the agricultural season can introduce dust from tilling and planting, leading to temporary spikes in particulate matter. 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, though this is less pronounced than in more southerly locations. Autumn (September-November) presents the most significant air quality challenges. Harvest season coincides with a period of increased soil disturbance and, occasionally, unauthorized agricultural burning, releasing significant amounts of smoke and particulate matter. Temperature inversions, common during this period, trap pollutants near the ground, exacerbating the problem. Fog, frequent in autumn, further reduces visibility and concentrates pollutants. Winter (December-February) brings cold temperatures and often calm conditions, which can lead to the accumulation of pollutants, particularly from residential heating (often using solid fuels). Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during autumn and winter mornings, especially when fog is present. During harvest season, staying indoors with windows closed and using air purifiers can provide some relief. Spring and summer offer the most favorable conditions for outdoor activities, but awareness of potential dust and ozone levels remains important.