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Korostyshiv, nestled within the Zhytomyrska Oblast of Ukraine at coordinates 50.3167°N, 29.0667°E, occupies a gently undulating landscape characteristic of the Polesia region. The city sits approximately 80-90 meters above sea level, a relatively flat elevation contributing to potential air stagnation. The surrounding terrain is predominantly agricultural, with extensive fields of grain and sunflowers dominating the vista, interspersed with patches of mixed deciduous forest. The Ros' River, a tributary of the Dnieper, flows nearby, influencing local humidity and potentially contributing to fog formation, which can trap pollutants. Korostyshiv isn’t situated within a major industrial belt, but smaller-scale agricultural processing and light manufacturing contribute to localised emissions. The urban-rural gradient is fairly sharp; the city itself is compact, with a population of around 24,129, quickly giving way to open farmland. This proximity to agricultural land means seasonal burning of crop residue is a significant factor. The prevailing winds, generally from the west, can transport pollutants from surrounding areas, while calm conditions can lead to a build-up of locally generated emissions. The city’s geographical position, within a broad river valley, can exacerbate temperature inversions, trapping pollutants near ground level, particularly during colder months. Understanding these factors is crucial for assessing and mitigating air quality challenges.

Korostyshiv experiences a distinct seasonal air quality pattern dictated by meteorological conditions and human activity. Spring (March-May) sees a rise in particulate matter due to agricultural burning as farmers prepare fields for planting. Wet conditions often limit dispersion, leading to localised pollution episodes. Summers (June-August) generally offer the cleanest air, with prevailing winds and occasional rainfall effectively flushing out pollutants. However, heatwaves can trigger ground-level ozone formation. Autumn (September-November) brings a return of agricultural burning, combined with the onset of temperature inversions as temperatures drop, trapping smoke and other pollutants. This is often the most polluted period. Winters (December-February) are characterised by stable, cold air masses and frequent temperature inversions, leading to prolonged periods of poor air quality from domestic heating sources – wood and coal burning are common. Fog is also prevalent, exacerbating pollution. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit strenuous outdoor activity during autumn and winter. March and July typically offer the most favourable conditions for outdoor pursuits. Monitoring wind direction and avoiding activity near agricultural areas during burning season is advisable.