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Ocna Mureș, nestled within the Alba County of Romania, occupies a unique and historically significant geographic position. Located at approximately 46.39° N, 23.86° E, the town sits within the Transylvanian Basin, a geological depression characterized by rolling hills and fertile plains. Its elevation of around 280 meters above sea level contributes to a localized microclimate, often experiencing temperature inversions, particularly during colder months. The surrounding landscape is predominantly agricultural, with extensive fields of wheat, corn, and rapeseed dominating the rural areas. To the west, the landscape gradually rises towards the Poiana Ruscă Mountains, influencing prevailing wind patterns. Historically, Ocna Mureș’s geography has been intrinsically linked to its salt mining industry, a legacy that continues to shape the town’s character. The presence of salt lakes, remnants of former brine extraction, creates a distinctive visual feature and influences local humidity. The urban–rural gradient is relatively sharp; the town itself is compact, transitioning quickly to agricultural land. While not directly adjacent to a major river, the area benefits from groundwater resources, impacting local hydrology. The town’s position within the Transylvanian Basin, coupled with its proximity to agricultural zones and the influence of surrounding hills, creates a complex interplay of factors that can significantly impact air quality, particularly concerning particulate matter and agricultural emissions. The lack of significant industrial belts immediately adjacent to the town mitigates some pollution risks, but agricultural practices and seasonal burning remain key considerations.

Ocna Mureș experiences a continental climate, resulting in distinct seasonal variations that profoundly influence air quality. Spring (March-May) often brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated pollutants. However, this period is also marked by agricultural activities, including fertilizer application and, occasionally, controlled burning of crop residues, which can lead to spikes in particulate matter. Summer (June-August) generally sees the best air quality, with consistent winds and higher temperatures promoting dispersion. However, prolonged heatwaves can exacerbate ozone formation, a secondary pollutant. Autumn (September-November) presents a more complex picture. As temperatures cool, the likelihood of temperature inversions increases, trapping pollutants near the ground. Agricultural burning is also more prevalent during this season, significantly degrading air quality. The combination of cooler temperatures, stagnant air, and agricultural emissions often results in the poorest air quality of the year. Winter (December-February) is characterized by cold temperatures, frequent fog, and often, stable atmospheric conditions. These conditions exacerbate temperature inversions, leading to prolonged periods of poor air quality, particularly from residential heating using wood or coal. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during periods of fog and temperature inversions, especially in the autumn and winter months. Avoiding outdoor exercise during the early morning hours, when pollutants are often concentrated, is also advisable. Public health advisories regarding agricultural burning should be heeded, and minimizing the use of wood-burning stoves can contribute to improved air quality for everyone.