微塑料(MP)暴露在环境中通常被证明对人类健康有不利影响。大多数关于MP的研究与水生和陆生系统有关,当暴露在大气中时,它对生态系统和人类健康的潜在风险还没有得到很好的理解。提出的研究,拿着西安,中国西北的一个大城市,作为一个例子,首先估计了当地居民承受议员污染的可能性。结果计算出TSP中MP的平均丰度,PM10,PM2.5分别为12.5、3.5和0.8颗粒/L,分别。在大气中鉴定出总共15种聚合物类型的MPs。虽然物种敏感性分布(SSD)方法被认为是有用的估计污染物的潜在风险,SSD用于评估MP风险的结果值得商榷。在这项研究中,基于SSD的风险评估表明,西安市大气MP污染尚未达到威胁人类的水平。然而,与化学品不同,使用MPs的剂量反应关系来评估风险是不可靠的,因为MPs的毒性作用不仅会受到丰度的影响,而且还会受到特征的影响。例如,形态大小,形状和氧化电位。由于对MP特性及其毒性作用之间的相对关系的机制理解不足,以及毒性数据的质量和相关性有限,大气议员风险评估的不确定性是不可避免的,大气议员的风险往往被低估。这对制造商和公共卫生当局构成了挑战,以及研究人员一样,然而,我们已经接触到大气议员了。
Microplastic (MP) exposure in the environment has been commonly demonstrated to have adverse effects on human health. The majority of studies on MP were related to the aquatic and terrestrial systems, its potential risk for ecosystem and human health when exposed to the atmosphere is not well-understood. The presented
study, taking Xi\'an, a megacity in Northwest China, as an example, first estimated the possibility of local residents bearing MPs pollution. The results figured out an average abundance of MPs in TSP, PM10, and PM2.5 was 12.5, 3.5 and 0.8 particles/L, respectively. A total of 15 polymer types of MPs were identified in the atmosphere. Although a species sensitivity distribution (SSD) approach is acknowledged to be useful to estimate the potential risk of pollutants, the result of SSD when used to evaluate the risk of MPs is debatable. In this
study, SSD-based risk assessment showed that the atmospheric MP pollution in Xi\'an had not yet reached the level of threatening human. However, unlike chemicals, it is unreliable to assess risk using the relationship of dose-response for MPs because toxic effects of MPs can be influenced by not only the abundance but also the characteristics, e.g., morphological size, shape and oxidative potential. Since insufficient mechanistic understanding regarding the relative relationship between MP characteristics and their toxic effects and limitation of the quality and relevance of toxicity data, the uncertainty of risk assessment of the atmospheric MPs is inevitable and the risk of the atmospheric MPs was tended to be underestimated. This poses a challenge to manufacturers and public health authorities, as well as researchers alike, however, we are already being exposed to the atmospheric MPs.