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Aytos, nestled in the Burgas Province of Bulgaria, occupies a strategic position in the southeastern part of the country. The city is situated approximately 30km west of the Black Sea coast, benefiting from a temperate continental climate with Mediterranean influences. The terrain surrounding Aytos is characterized by rolling hills and plains, part of the larger Burgas Plain, with the Aytos-Karaburun range rising to the south. This topography plays a crucial role in air quality, as the hills can trap pollutants during periods of calm weather. The proximity to the Black Sea introduces maritime air masses, which can sometimes help disperse pollution, but also contribute to humidity and fog formation. Aytos is largely surrounded by agricultural land, primarily cereal crops and vineyards, with some smaller industrial zones concentrated around the city itself. The urban-rural gradient is relatively sharp, transitioning quickly from the built-up areas of Aytos to the open countryside. This proximity to agricultural activities introduces potential sources of particulate matter from field work and seasonal burning. The city’s elevation, around 150m above sea level, further influences local wind patterns and pollutant dispersion. Understanding these geographical factors is key to comprehending Aytos’s air quality challenges.

Aytos experiences distinct seasonal variations in air quality. Spring (March-May) often sees a rise in particulate matter due to agricultural activities – ploughing, sowing, and controlled burns to clear fields. Winds are variable, sometimes offering dispersion, but temperature inversions can trap pollutants near the ground. Summer (June-August) generally presents the cleanest air, with prevailing sea breezes helping to flush out contaminants and higher temperatures promoting better atmospheric mixing. However, prolonged heatwaves can exacerbate ozone formation. Autumn (September-November) is a transitional period, with increasing heating demands leading to higher emissions from domestic sources, particularly wood and coal burning. Fog is common, trapping pollutants and reducing visibility. November is often the most polluted month. Winter (December-February) brings the poorest air quality. Cold temperatures increase reliance on solid fuel heating, and stable atmospheric conditions, including frequent temperature inversions, prevent pollutant dispersal. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during these colder months. Periods of strong southerly winds from the Black Sea can offer temporary relief, but these are infrequent. Monitoring conditions closely is vital.