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Mobile Platform III: Characterizing Spatially Inhomogeneous Non-Criteria Pollutants in the Los Angeles Air Basin.
| 题名： | Mobile Platform III: Characterizing Spatially Inhomogeneous Non-Criteria Pollutants in the Los Angeles Air Basin. |
| 关键词： | platform；spatial；angel；mobile；iter；eles；ants；gele；homo；gene |
| 摘要： | A number of epidemiological studies have shown that exposure to elevated levels of fresh vehicular emissions causes a wide range of adverse human health effects. Fresh vehicular emissions contain a wide range of particle- and gas-phase species. Because such emissions are emitted and diluted together, their individual impacts are difficult to separate. Ultrafine particles (UFP) might contribute to the degradation of health associated with exposure to elevated levels of fresh vehicular emissions, but they are also an excellent tracer for fresh vehicle emissions, and are one of the foci of this study. In urbanized areas, a large fraction of households are commonly located near freeways. In a highly urbanized area such as the California South Coast Air Basin (SoCAB), approximately 50% of the population liveswithin 1.5 km of freeways. An earlier mobile measurement platform study under the direction of Drs. Winer and Paulson demonstrated a large pollutant impact zone, extending beyond 2.5 km downwind of a freeway in Santa Monica, California during pre-sunrise hours. The current study explores the variability of extended freeway plumes at several locations in Southern California. The ARB mobile measurement platform (MMP) was employed to measure vehicle-related pollutant concentrations on transects running upwind and downwind perpendicular to four freeway segments in the coastal, central and eastern areas (downtown Los Angeles, Paramount, Carson and Claremont) of the California South Coast Air Basin (SoCAB) during the pre-sunrise period (04:30-06:30). |
| 报告类型： | 科技报告 |
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