摘要目的:了解境外输入和污染传播高风险岗位职业人群在工作中口罩佩戴及对口罩知识掌握情况。方法:采用方便抽样方法，于2022年5月14至17日对北京市境外输入和污染传播高风险岗位的963名作业人员进行线上调查。分析作业人员工作中个人使用口罩的行为、单位发放及监督佩戴情况、个人口罩防护知识掌握和佩戴主观感受等情况，对选用口罩正确与否的影响因素采用χ 2检验和logistic回归模型进行分析。 结果:境外输入和污染传播高风险岗位人员主要为男性（86.0%，828/963），年龄集中在18~44岁（68.2%，657/963），文化程度以大专或本科为主（49.4%，476/963）。79.4%（765/963）的作业人员选择口罩类型恰当，女性、45~59岁和高中及以上文化程度是其口罩正确选用的危险因素（ P<0.05）。作业人员佩戴/脱除等行为均较好，但能够正确排序不同口罩防护效果的仅占10.5%（101/963）；98.4% （948/963）的人员认为工作单位能为员工配发口罩，单位组织规范口罩使用的相关培训及监督检查口罩佩戴情况分别占99.1% （954/963）、98.2% （946/963）；47.4%（456/963）的人员佩戴口罩期间存在不舒适情况。 结论:境外输入和污染传播高风险岗位职业人群口罩总体选择、使用情况有待进一步规范，需强化监督检查职业人群使用口罩行为，采取改进措施提高佩戴口罩的舒适性。

abstractsObjective:To investigate the wearing of masks and the knowledge of masks among high-risk positions for overseas import and pollution transmission.Methods:From May 14 to 17, 2022, a convenient sampling method was used to conduct an online survey among 963 workers in high-risk positions for overseas import and pollution transmission in Beijing. The behaviors of individual use and wearing masks, the distribution and supervision of the unit, the knowledge of personal mask protection and the subjective feelings of wearing masks were analyzed. The χ 2 test and logistic regression model were used to analyze the influencing factors of the correct selection of masks. Results:The majority of the workers in high-risk positions for overseas import and pollution transmission were male (86.0%, 828/963), age concentration in 18-44 years old (68.2%, 657/963), and the majority of them had college or bachelor degrees (49.4%, 476/963). 79.4%(765/963) of the workers chose the right type of masks, female, 45-59 years old and high school education or above were the risk factors for correct selection of masks ( P <0.05). Workers had good behaviors such as wearing/removing masks, but only 10.5% (101/963) could correctly rank the protective effect of different masks. 98.4% (948/963) of the workers believed that their work units had provided masks to their employees, and 99.1% (954/963) and 98.2%(946/963) of them had organized training and supervision on the use of masks, respectively. 47.4%(456/963) of the workers were uncomfortable while wearing masks. Conclusion:The overall selection and use of masks among occupational groups in high-risk positions for overseas import and pollution transmission in China need to be further standardized. It is necessary to strengthen supervision and inspection on the use of masks among occupational groups, and take improvement measures to improve the comfort of wearing masks.