Abstract The widespread legalization of recreational cannabis use raises growing concerns about exposure to secondhand cannabis smoke (SCS). However, few studies are characterizing fine particulate matter (PM2.5) exposure from SCS. Here, we determined PM2.5 calibration factors (CFs) for SCS from four common cannabis consuming methods—glass pipe smoking, joint smoking, bong smoking, and cannabis pen vaping—for widely used optical monitors (SidePak™ AM510, TSI Inc., Shoreview, MN) by comparing the monitors with gravimetric mass measurements. We furthermore investigated the emission rate, particle size distribution, and particle removal rate of SCS. The CFs of SidePak PM2.5 monitors measuring the four types of SCS were 0.31 (SE = 0.02), 0.39 (SE = 0.02), 0.40 (SE = 0.01), and 0.44 (SE = 0.03), respectively. The arithmetic mean emission rates of the four SCS sources were ~2–6 times that of secondhand tobacco smoke (STS) on a per-puff basis. The fresh SCS (1-min after smoking) showed a bimodal size distribution—one mode located at ~380–420 nm and another at ~800–840 nm. Under low-ventilation conditions, the indoor removal rates of SCS from cannabis vaping were slightly higher (i.e., 0.61–0.77/h) than those for the other three sources (i.e., 0.35–0.53/h).

中文翻译：

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常见吸食方法产生的二手大麻烟的特征：校准因子、排放率和颗粒去除率

摘要 娱乐性大麻使用的广泛合法化引发了人们对接触二手大麻烟雾 (SCS) 的日益关注。然而，很少有研究表征来自 SCS 的细颗粒物 (PM2.5) 暴露。在这里，我们为广泛使用的光学监测器（SidePak™ AM510，TSI Inc.， Shoreview, MN）通过将监测器与重力质量测量值进行比较。我们进一步研究了 SCS 的排放率、粒度分布和颗粒去除率。SidePak PM2.5 监测仪测量四种 SCS 的 CF 分别为 0.31 (SE = 0.02)、0.39 (SE = 0.02)、0.40 (SE = 0.01) 和 0.44 (SE = 0.03)。四种 SCS 源的算术平均排放率是每口二手烟草烟雾 (STS) 的约 2-6 倍。新鲜的 SCS（吸烟后 1 分钟）显示出双峰尺寸分布——一种模式位于 ~380–420 nm，另一种模式位于 ~800–840 nm。在低通风条件下，从大麻电子烟中去除 SCS 的室内去除率（即 0.61-0.77/h）略高于其他三种来源（即 0.35-0.53/h）。