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Mena, situated in the Chernihivska Oblast of Ukraine at coordinates 51.5167°N, 32.2167°E, occupies a relatively flat portion of the East European Plain. The terrain is characterised by gently rolling plains, typical of the Polesia region, with an elevation generally below 150 meters. This low-lying geography influences air quality, as temperature inversions – where cooler air traps pollutants near the ground – are common, particularly during stable atmospheric conditions. The city is bisected by the Mena River, a tributary of the Desna River, which provides some natural ventilation but also contributes to localised humidity and potential fog formation. Surrounding Mena is a predominantly agricultural landscape, with extensive fields of grains and sunflowers. While not a major industrial hub itself, the region has historical ties to agricultural processing and some light manufacturing in nearby towns. The urban-rural gradient is quite sharp; moving just a few kilometers from Mena quickly transitions into open farmland and forested areas. This proximity to agricultural land means seasonal burning of crop residue can significantly impact local air quality, and the prevailing westerly winds can carry pollutants from regional sources. The city’s position within the broader Dnieper basin also means it’s susceptible to long-range transport of pollutants from more heavily industrialised areas further east.

Mena experiences a continental climate, with distinct seasonal variations impacting air quality. Spring (March-May) sees a gradual improvement after winter, but agricultural burning begins, contributing to particulate matter spikes. Westerly winds are common, potentially bringing pollutants from further afield. Summer (June-August) generally offers the cleanest air, with prevailing winds dispersing pollutants and rainfall acting as a natural scrubber. However, heatwaves can exacerbate ozone formation. Autumn (September-November) is marked by increased heating demand, leading to higher emissions from domestic sources, particularly wood and coal burning. Fog is also frequent, trapping pollutants. November often sees the poorest air quality as temperature inversions become more stable. Winter (December-February) is the most challenging period. Low temperatures drive increased reliance on solid fuel heating, resulting in high concentrations of particulate matter and sulfur dioxide. Snow cover reflects pollutants, increasing their concentration near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during November and December, and consider using air purifiers indoors. Periods of strong winds in March and July offer temporary relief, but consistent monitoring is crucial.