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Cahul, Moldova, situated in the country’s southern reaches, occupies a unique geographic position within the Bessarabian steppe. The city lies on the right bank of the Prut River, forming part of the Moldova-Romania border. The terrain is generally flat, characteristic of the steppe landscape, with a slight southward slope. This flatness contributes to potential air stagnation, particularly during stable atmospheric conditions. Cahul’s elevation is relatively low, around 25-30 meters above sea level, further reducing atmospheric dispersion. Surrounding Cahul are extensive agricultural lands, primarily dedicated to viticulture, orchards, and grain production. While not heavily industrialized, the presence of food processing facilities and smaller manufacturing units contributes to localized emissions. The urban-rural gradient is fairly sharp; the city itself is a concentrated area, quickly transitioning to open farmland. The Prut River, while a vital water source, can also act as a conduit for pollutants transported from upstream sources, particularly during periods of low flow. The prevailing winds are generally from the northwest, potentially carrying pollutants from industrial areas further inland, but local wind patterns are heavily influenced by the river valley and surrounding agricultural fields. This combination of factors creates a specific microclimate that impacts air quality.

Cahul’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a gradual improvement after the winter months, but agricultural activities – including fertilizer application and burning of vegetation – can lead to spikes in particulate matter. Summer (June-August) typically offers the cleanest air, benefiting from prevailing winds and rainfall that help disperse pollutants. However, high temperatures can promote ground-level ozone formation, especially on still, sunny days. Autumn (September-November) is often marked by a deterioration in air quality due to increased heating demands and the burning of agricultural waste after the harvest. This period frequently experiences temperature inversions, trapping pollutants near the ground. Winter (December-February) presents the most challenging conditions. Reduced sunlight, stable atmospheric conditions, and increased reliance on solid fuels for heating contribute to elevated levels of particulate matter and sulfur dioxide. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during autumn and winter. Months to favour for outdoor activity are June, July, and August, but even then, monitoring local conditions is advisable. Fog, common in the cooler months, can exacerbate pollution by trapping pollutants.