Observations of particulate matter less than 10 µm (PM₁₀) were conducted from January to December in 2015 in the Ciuc basin, Eastern Carpathians, Romania. Daily concentrations of PM₁₀ ranged from 10.90 to 167.70 µg/m³, with an annual mean concentration of 46.31 µg/m³, which is higher than the European Union limit of 40 µg/m³. Samples were analyzed for a total of 21 elements. O, C and Si were the most abundant elements accounting for about 85% of the PM₁₀ mass. Source identification showed that the elemental composition of PM₁₀ is represented by post volcanic activity, crustal origin, and anthropogenic sources, caused by the resuspension of crustal material, sea salt and soil dust. The average PM₁₀ composition was 72.10% soil, 20.92% smoke K, 13.84% salt, 1.53% sulfate and 1.02% organic matter. The back-trajectory analysis showed that the majority of PM₁₀ pollution comes from the West, Southwest and South.

2015年1月至12月在罗马尼亚东喀尔巴阡山脉Ciuc盆地进行了小于10微米的颗粒物（PM ₁₀ ）观测。 PM ₁₀日浓度为10.90～167.70 µg/m ³，年平均浓度为46.31 µg/m ³，高于欧盟40 µg/m ³的限值。样品中总共分析了 21 种元素。 O、C和Si是最丰富的元素，约占PM ₁₀质量的85%。来源识别表明，PM ₁₀的元素组成以火山后活动、地壳来源和人为来源为代表，由地壳物质、海盐和土壤灰尘的再悬浮引起。 PM ₁₀平均成分为72.10%土壤、20.92%烟钾、13.84%盐、1.53%硫酸盐和1.02%有机物。回轨分析表明，PM ₁₀污染主要来自西部、西南部和南部。