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Svilengrad, nestled in southeastern Bulgaria within the Haskovo Province, occupies a strategically vital location at the tri-border point of Bulgaria, Greece, and Turkey. Its coordinates (41.7670, 26.2000) place it within a gently undulating terrain, part of the Thracian Plain, characterized by fertile agricultural lands and rolling hills. The city sits at an elevation of approximately 450 meters above sea level, influencing local weather patterns and air circulation. Svilengrad’s urban character is that of a small, primarily residential town, historically significant as a border crossing and trading hub. The surrounding landscape is predominantly agricultural, with extensive fields of cereals, sunflowers, and vineyards stretching outwards. This agricultural activity, while economically important, can contribute to localized air pollution through the use of fertilizers and machinery emissions. To the south, the landscape gradually rises towards the Rhodope Mountains, impacting prevailing wind patterns and potentially trapping pollutants under certain meteorological conditions. The urban–rural gradient is relatively sharp; the town transitions quickly into agricultural fields and then into the foothills of the Rhodope range. The proximity to Greece and Turkey means that transboundary air pollution is a potential factor, with pollutants originating from industrial areas or agricultural burning in neighboring countries occasionally impacting Svilengrad’s air quality. The Maritsa River, though not directly adjacent, flows nearby, influencing regional humidity and potentially affecting the dispersion of airborne particles.

Svilengrad’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Spring (March-May) often sees a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural activities, including fertilizer application and early field preparation, can introduce localized emissions. Summer (June-August) typically brings drier conditions and higher temperatures, which can exacerbate ozone formation, a secondary pollutant. Stagnant air masses during heatwaves can trap pollutants, leading to periods of reduced visibility and potential respiratory irritation. Autumn (September-November) is arguably the most challenging period. Cooler temperatures combined with decreasing wind speeds frequently lead to temperature inversions, where a layer of warm air traps cooler air (and pollutants) near the ground. Agricultural burning, a traditional practice in the region, also significantly contributes to particulate matter pollution during this season. Winter (December-February) often brings cold, stable air and fog, which further restricts pollutant dispersion. While industrial activity may decrease, domestic heating using wood or coal can contribute to localized pollution, particularly in the mornings. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during autumn and winter, limiting outdoor activity on days with visible haze or reduced air quality. Spring and summer generally offer better conditions, but awareness of ozone levels during heatwaves remains important. Careful monitoring of local weather forecasts and public health advisories is recommended throughout the year.