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Veliki Preslav, nestled in the Shumen Province of northeastern Bulgaria, occupies a unique geographic position within the Danubian Plain. The city sits at an elevation of approximately 230 meters (755 feet), gently undulating terrain characteristic of the region. This landscape, formed by glacial and fluvial processes, contributes to localized air stagnation. The proximity to the Poroyna River, a tributary of the Yantra, introduces humidity but doesn’t significantly mitigate pollution dispersion. Historically, Veliki Preslav was a major medieval Bulgarian capital, and its urban fabric reflects this layered history, with a mix of older residential areas and more recent Soviet-era construction. Surrounding the city is a predominantly agricultural zone, dominated by grain farming and livestock rearing, which contributes to particulate matter through dust and ammonia emissions. While not a major industrial hub, smaller-scale agricultural processing and local manufacturing contribute to the pollution profile. The urban-rural gradient is relatively sharp, transitioning quickly to open farmland. The prevailing winds, often from the north and northwest, can carry pollutants from regional sources, impacting local air quality. The city’s bowl-shaped topography can exacerbate pollution build-up, particularly during calm weather conditions, trapping emissions and reducing ventilation.

Veliki Preslav experiences a continental climate, resulting in distinct seasonal air quality patterns. Winter (December-February) often sees the poorest air quality, driven by increased reliance on solid fuel heating – wood and coal – for residential warmth. Temperature inversions are common during these months, trapping pollutants near the ground. Spring (March-May) brings a gradual improvement as temperatures rise and heating demand decreases, though agricultural activities like field preparation can elevate particulate matter. Summer (June-August) generally offers the cleanest air, aided by prevailing winds and higher atmospheric mixing. However, prolonged heatwaves can lead to increased ozone formation. Autumn (September-November) presents a transitional period. The burning of agricultural waste after harvest contributes to localized spikes in particulate pollution. Fog, frequent in the autumn and winter, further reduces visibility and exacerbates pollutant concentrations. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Spring and summer offer more favourable conditions, but awareness of ozone levels during heatwaves is crucial. Monitoring local conditions and adjusting activity levels accordingly is recommended throughout the year.