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Evaluation of Health Symptoms and Air Exposures in Multiple Communities near Oil and Gas Operations in Colorado

机译:科罗拉多州油气运营附近多个社区的健康症状和空气暴露评估

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Unconventional oil and gas (OG) activity in Colorado is increasing in areas with large population growth. Community scale exposures to substances emitted from OG operations is a public health concern. The Colorado Department of Public Health and Environment (CDPHE) has received over 200 citizen reports of acute health symptoms and odors during the development phases of drilling, fracking, and flowback by people living near OG sites. In response to reports of citizen health symptoms, we have completed six community exposure investigations, resulting in over 800 hours of air samples for 64 OG related volatile organic compounds (VOCs) and select criteria air pollutants collected during different phases of OG operations. Investigations included 15 grab samples collected by either citizens or staff, downwind of the OG site during times of reported symptoms/odors in attempt to quantify maximum exposures. To capture continuous air measurements of VOCs and meteorological conditions over a longer time during different phases of operations, we deployed our mobile laboratory four times to two different communities. For each exposure investigation, we conducted screening level health risk evaluations to assess the potential for acute and chronic non-cancer and cancer health effects to occur to in those communities. For all community samples, all individual and combined VOCs had hazard quotients below 1 for non-cancer health effects and were within EPAs acceptable excess cancer risk range. Based on our evaluation of the continuous air monitoring, there is no clear evidence that airborne VOCs from OG operations result in potentially harmful long-term exposures to those living nearby. Although limited, our analysis of grab samples also suggests a low risk of harm from short-term acute exposures. More extensive site specific community level air monitoring is needed to fully understand the relationship between reported health symptoms and OG air exposures in Colorado.
机译:在人口大量增长的地区,科罗拉多州的非常规石油和天然气(OG)活动正在增加。社区范围内暴露于OG运营所产生的物质的暴露是一个公共卫生问题。科罗拉多州公共卫生与环境部(CDPHE)收到了200多份居民报告,这些报告涉及居住在OG地点附近的人们在钻探,压裂和回流过程中的急性健康症状和气味。为响应市民健康症状的报告,我们完成了六次社区接触调查,收集了800多个小时的空气样本,用于64种OG相关的挥发性有机化合物(VOC),并选择了在OG操作不同阶段收集的标准空气污染物。调查包括公民或工作人员收集的15个抓取样本,在报告的症状/气味期间,在OG站点的下风处试图量化最大暴露量。为了在不同的运营阶段中获取较长时间的VOC和气象条件的连续空气测量值,我们将移动实验室四次部署到两个不同的社区。对于每个暴露调查,我们进行了筛查级健康风险评估,以评估这些社区中可能发生的急性和慢性非癌症和癌症健康影响。对于所有社区样本,所有单个和组合的VOC的非癌症健康影响危险系数均低于1,且均在EPA可接受的过量癌症风险范围内。根据我们对连续空气监测的评估,没有明显的证据表明来自OG运营的机载VOC对附近居住的人可能造成长期有害的长期暴露。尽管有限,但我们对抓取样品的分析还表明,短期急性暴露对人体造成伤害的风险较低。需要更广泛的针对特定场所的社区级空气监测,以充分了解科罗拉多州报告的健康症状与OG空气暴露之间的关系。

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