Taxi drivers’ exposure to traffic‐related air pollutants inside their vehicles has been reported in different countries but not yet in Lebanon. Thus, we conducted a cross‐sectional study on 20 Lebanese taxi drivers to (1) assess their exposure to ultrafine particles (UFP) and black carbon (BC) inside their vehicles and (2) identify determinants of this exposure. UFP and BC were measured using Diffusion Size Classifier Miniature^® and microAeth^® Model AE51, respectively, for 5 hours. Data on characteristics of vehicles and trips were collected by face‐to‐face interviews. Associations between pollutant levels and their determinants were analyzed by multiple linear regression. The mean of UFP count (35.2 ± 17.6 x 10³ particles cm^‐3) and BC (5.2 ± 1.9 μg m^‐3) concentrations in‐taxis was higher in the morning measurements compared with those in the afternoon measurements. UFP count increased in‐taxis by 60% for every 10 minutes spent in blocked traffic and by 84% starting from two trips with smokers compared to trips without smokers. Conversely, UFP count decreased by 30% for every 10 minutes under both air‐conditioning and air recirculation mode with windows closed. BC was not affected by any of these factors. Our findings suggest easy ways to reduce UFP exposure inside vehicles for all commuters.

中文翻译：

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车辆在黎巴嫩出租车内暴露于超细颗粒和黑碳的横断面研究。

据报导，出租车司机在车内暴露于与交通有关的空气污染物中，但黎巴嫩却没有。因此，我们对20名黎巴嫩出租车司机进行了横断面研究，以（1）评估他们在车内受到的超细颗粒（UFP）和黑碳（BC）的暴露，并（2）确定这种暴露的决定因素。UFP和BC使用扩散大小分级微型测量^®和microAeth ^®模型AE51，分别为5小时。通过面对面访谈收集有关车辆和出行特征的数据。通过多元线性回归分析污染物水平与其决定因素之间的关联。UFP计数的平均值（35.2±17.6×10个³颗粒cm的^-3）和早晨测量的BC和BC（5.2±1.9μgm ^-3）浓度高于下午测量的浓度。相对于没有吸烟者的旅行，UFP计数在阻塞交通中每10分钟的乘车量增加了60％，从两次吸烟者的旅行开始，增加了84％。相反，在关闭窗户的空调和空气再循环模式下，UFP计数每10分钟减少30％。BC不受任何这些因素的影响。我们的发现提出了减少所有通勤者车辆内UFP暴露的简便方法。