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Karnobat, nestled in the Burgas Province of Bulgaria, occupies a geographically significant position within the Rhodope-Srednogorie transitional zone. Located at approximately 42.65° N, 26.98° E, the city sits at an elevation of around 230 meters above sea level, contributing to a relatively mild climate but also influencing local air circulation patterns. Karnobat’s terrain is characterized by rolling hills and valleys, a landscape shaped by the Maritsa River and its tributaries, which provide a vital water source and influence humidity levels. The surrounding landscape is a blend of agricultural land – primarily vineyards and orchards, reflecting the region’s viticultural heritage – and forested areas, particularly to the south and west. This agricultural activity, while economically important, can contribute to seasonal particulate matter emissions. Karnobat’s urban fabric is compact, with a historical core gradually expanding outwards. The city’s proximity to the Trakia Industrial Zone, a significant economic belt further west, introduces potential for industrial air pollution, although the distance mitigates direct impacts. The urban-rural gradient is relatively sharp, with agricultural fields and smaller villages bordering the city limits. The prevailing winds generally flow from the northwest, carrying air masses across the surrounding plains and potentially impacting Karnobat’s air quality. Topographically, the slight basin-like nature of the area can occasionally trap pollutants, especially during periods of calm weather, exacerbating local air quality challenges. The Maritsa River's presence moderates temperatures and influences humidity, but also presents a potential pathway for pollutants to disperse or concentrate.

Karnobat’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Spring (March-May) often sees a rise in pollen levels, impacting respiratory health, alongside increased agricultural activity which can release dust and ammonia. The warming temperatures and increased sunlight also promote photochemical reactions, potentially leading to ground-level ozone formation. Summer (June-August) typically brings drier conditions and calmer winds, which can lead to stagnant air and the accumulation of pollutants, particularly during heatwaves. While rainfall can help cleanse the atmosphere, prolonged dry spells exacerbate the issue. Autumn (September-November) marks a transition period, with cooler temperatures and more frequent rainfall, generally improving air quality. However, agricultural burning, a traditional practice in the region, can significantly degrade air quality during this time, releasing particulate matter and other pollutants. Winter (December-February) often presents the most challenging conditions. Temperature inversions, where cold air becomes trapped beneath a layer of warmer air, are common, preventing the vertical dispersion of pollutants. Fog, frequently occurring during winter months, further traps pollutants near ground level. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor exertion during periods of stagnant air, particularly in winter and during agricultural burning season. Monitoring local weather forecasts and air quality reports is crucial for informed decision-making regarding outdoor activities. Increased ventilation in homes and workplaces is also recommended during periods of poor air quality.