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Târnăveni, nestled in Mureş County, Romania, occupies a strategic position within the Transylvanian Basin. The city’s coordinates (46.3297, 24.2700) place it amidst rolling hills and plains, at an elevation of approximately 330 meters. This terrain, while offering scenic beauty, contributes to localized air stagnation, particularly during temperature inversions. The Târnăviţa River flows nearby, but its influence on widespread pollutant dispersion is limited due to the valley’s topography. Târnăveni’s urban character is defined by a blend of historical architecture and post-industrial development. Historically, the city was a significant textile manufacturing centre, and remnants of this industrial past – though diminishing – still influence the local economy and, potentially, air quality. Surrounding Târnăveni are predominantly agricultural lands, with fields of wheat, corn, and other crops dominating the landscape. This agricultural activity introduces particulate matter from soil erosion and agricultural practices. The urban-rural gradient is relatively sharp, with a noticeable shift in air quality as one moves away from the city centre towards the surrounding countryside. The city’s location within a basin means pollutants can accumulate, especially during calm weather conditions, making it vulnerable to localised pollution episodes. Understanding this geographic context is crucial for assessing and mitigating air quality challenges.

Air quality in Târnăveni exhibits a distinct seasonal pattern. Winter, from December to February, often sees the poorest air quality. Low temperatures create temperature inversions, trapping pollutants near the ground, exacerbated by increased residential heating using coal and wood. Calm wind conditions further contribute to this stagnation. Spring (March-May) brings a gradual improvement as temperatures rise and rainfall increases, washing away accumulated pollutants. However, agricultural activities begin, introducing dust and pollen into the air. Summer (June-August) generally offers the cleanest air, with higher temperatures promoting dispersion and frequent rainfall providing cleansing. However, prolonged heatwaves can lead to ozone formation. Autumn (September-November) sees a deterioration in air quality as heating demand increases again, and agricultural burning practices become more common. October and November are particularly problematic. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind patterns is crucial; westerly winds generally bring cleaner air, while easterly winds can carry pollutants from industrial areas further east. Fog, common in the cooler months, can trap pollutants and reduce visibility, worsening air quality.