Exposure Core

接触评估核心将负责收集数据，以便能够估计三项健康研究的接触情况。这将包括：1）从空气资源委员会收集常规空气监测数据并进行质量检查; 2）在贝克斯菲尔德的一个中心地点建立多环芳烃（PAH）和内毒素的采样，并在那里收集和分析一年的样本，以建立PAH和内毒素的时间变化; 3）在多个地点收集1-2个月的PAH和内毒素的同期样本;（4）探讨常规空气污染物、多环芳烃和内毒素的空间分布格局。需要常规收集的污染物数据来了解社区目前的暴露梯度，这将因空气污染物而异，并促进项目3的健康影响分析。PM2.5的化学成分包括元素碳、有机碳、硝酸盐、硫酸盐和微量金属。此外，2010/201年秋季/冬季将在另外两个空气监测站收集PAH数据，为期2个月，2010年夏季将在另外5个空气监测站收集土地内毒素样本，为期1个月。这些正在收集，以提高对这些污染物在大贝克斯菲尔德地区的空间变异性的理解，这对中心的设计至关重要。该地区目前不存在此类空间数据。这些暴露数据将用于健康研究，作为其预备中心计划工作的一部分，但也将指导我们规划中心在成为完整中心时需要收集的数据。

The Exposure Assessment Core will be responsible for collecting data to enable estimates of exposures for the three health studies. This will include: 1) collecting and quality checking routine air monitoring data from the Air Resources Board; 2) establishing sampling for polycyclic aromatic hydrocarbons (PAHs) and endotoxin at a central site in Bakersfield and collecting and analyzing samples there for one year to establish the temporal variability for PAHs and endotoxin; 3) collecting contemporaneous samples for PAHs and endotoxin at multiple locations for 1-2 months; 4) exploring the varying spatial patterns for routine air pollutants, PAHs and endotoxin. The data for routinely collected pollutants are needed to understand current exposure gradients in the communities, which will differ by air contaminant, and to facilitate health effects analyses for Project 3. The PM2.5 chemical constituents will include elemental carbon, organic carbon, nitrate, sulfate, and trace metals. In addition, PAH data will be collected at two other air monitoring stations for a 2 month period in fall/winter 2010/201 land endotoxin samples will be collected at 5 other air monitoring stations for a 1 month period in summer 2010. These are being collected to improve the understanding of spatial variability of these pollutants in the greater Bakersfield area which is critical to the design of the center. No spatial data of this type currently exist for this area. These exposure data will be used by the health studies as part of their planned work for the pre-center, but will also guide us in planning the data the center will need to collect when it is a full center.