Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY, USA.
J Expo Sci Environ Epidemiol. 2018 Nov;28(6):522-529. doi: 10.1038/s41370-017-0005-x. Epub 2017 Dec 29.
E-cigarette (vaping) conventions are public events promoting electronic cigarettes, in which indoor use of e-cigarettes is allowed. The large concentration of people using e-cigarettes and poor air ventilation can result in indoor air pollution. In order to estimate this worst-case exposure to e-cigarettes, we evaluated indoor air quality in a vaping convention in Maryland (MD), USA. Real-time concentrations of particulate matter (PM) and real-time total volatile organic compounds (TVOCs), CO and NO concentrations were measured. Integrated samples of air nicotine and PM concentrations were also collected. The number of attendees was estimated to range from 75 to 600 at any single observation time. The estimated 24-h time-weighted average (TWA) PM was 1800 μg/m, 12-fold higher than the EPA 24-h regulation (150 μg/m). Median (range) indoor TVOCs concentration was 0.13 (0.04-0.3) ppm. PM and TVOC concentrations were highly correlated with CO concentrations, indicating the high number of people using e-cigarettes and poor indoor air quality. Air nicotine concentration was 125 μg/m, equivalent to concentrations measured in bars and nightclubs. E-cigarette aerosol in a vaping convention that congregates many e-cigarette users is a major source of PM, air nicotine and VOCs, impairing indoor air quality. These findings also raise occupational concerns for e-cigarette vendors and other venue staff workers.
电子烟（蒸气）大会是推广电子烟的公共活动，允许在室内使用电子烟。大量的人使用电子烟且通风不良会导致室内空气污染。为了评估这种最坏情况下的电子烟暴露，我们评估了美国马里兰州（MD）的一次蒸气大会的室内空气质量。实时测量了颗粒物（PM）和实时总挥发性有机化合物（TVOC）、CO 和 NO 浓度。还收集了空气尼古丁和 PM 浓度的综合样本。在任何一个单一的观察时间，与会者的估计人数在 75 到 600 人之间。估计的 24 小时时间加权平均值（TWA）PM 为 1800μg/m，是 EPA 24 小时规定（150μg/m）的 12 倍。中位数（范围）室内 TVOC 浓度为 0.13（0.04-0.3）ppm。PM 和 TVOC 浓度与 CO 浓度高度相关，表明有大量的人使用电子烟且室内空气质量很差。空气尼古丁浓度为 125μg/m，相当于在酒吧和夜总会测量到的浓度。在聚集了许多电子烟使用者的蒸气大会上，电子烟气溶胶是 PM、空气尼古丁和 VOCs 的主要来源，会损害室内空气质量。这些发现也对电子烟销售商和其他场地工作人员的职业健康产生了担忧。
