Microfibers (mf) are the most common type of microplastic in the environment. Few studies have focused on their abundance in atmospheric deposition in background environments. In the current study, we collected wet-only and bulk rainfall from four precipitation chemistry monitoring stations, primarily located in coastal areas around Ireland. Anthropogenic mf were observed in all samples; the average deposition across the four study sites was 80 mf m^–2 day^–1. Wet-only mf deposition was 70 mf m^–2 day^–1 compared with bulk deposition of 100 mf m^–2 day^–1. The wet-only collectors were estimated to capture ∼70% of the bulk collectors, suggesting that dry deposition makes up at least 30% of total deposition. Meteorological variables, i.e., relative humidity, rainfall volume, wind speed, and wind direction, were significantly related to mf abundance, suggesting that rainfall washout and air mass movement are important predictors of mf deposition in background regions. In total, 15% of all anthropogenic mf were identified as plastic. The most abundant polymer type was polyester or polyethylene terephthalate at 71%, followed by polyacrylonitrile at 11%, polyethylene at 11%, and polypropylene at 4%. The average deposition of plastic mf was 12 mf m^–2 day^–1.

中文翻译：

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欧洲（爱尔兰）外围的人为超细纤维和微塑料的环境大气沉积。

微纤维（mf）是环境中最常见的微塑料类型。很少有研究关注其在背景环境中大气沉积中的丰度。在当前的研究中，我们从主要位于爱尔兰沿海地区的四个降水化学监测站收集了仅湿润的降雨和大量降雨。在所有样品中均观察到人为的MF。四个研究地点的平均沉积量为80 mf m ^–2天^–1。纯湿法沉积为70 mf m ^–2天^–1，而大体积沉积为100 mf m ^–2天^–1。据估计，仅湿式集尘器可捕集约70％的整体集尘器，这表明干沉降至少占总沉降的30％。气象变量，即相对湿度，降雨量，风速和风向与mf丰度显着相关，这表明降雨冲刷和空气质量运动是背景区域mf沉积的重要预测因子。总体上，所有人类活动性mf中有15％被确定为塑料。最丰富的聚合物类型是71％的聚酯或聚对苯二甲酸乙二酯，其次是11％的聚丙烯腈，11％的聚乙烯和4％的聚丙烯。塑料mf的平均沉积量为12 mf m ^–2天^–1。