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SOME ISSUES IN THE STATISTICAL ANALYSIS OF VEHICLE EMISSIONS.
| 题名： | SOME ISSUES IN THE STATISTICAL ANALYSIS OF VEHICLE EMISSIONS. |
| 作者： | Wenzel-Tom; Singer-Brett-C; Slott-Robert |
| 关键词： | Air-pollution; Certification-; Compliance-; Emission-control-systems; Inspection-; Maintenance-; Regulatory-constraints; Standards-; Statistical-analysis; Statistical-sampling; Test-procedures; Vehicle-tests |
| 摘要： | Some of the issues complicating the statistical analysis of vehicle emissions and the effectiveness of emissions control programs are presented in this article. Issues discussed include: the variability of inter- and intra-vehicle emissions; the skewness of emission distribution from in use vehicles; the difficulty of obtaining statistically representative vehicle samples; the effect of repeated testing on a subset of the vehicle fleet; and, differences among common test methods and pollutant measurement devices. The article discusses the relevance of these issues in light of the following regulatory purposes: compliance testing of in-use vehicles that have certification standards; effectiveness evaluation of inspection and maintenance programs of vehicles; and emissions inventory estimates for air quality modeling and compliance planning. The article also provides a brief history and description of common vehicle emission tests. |
| 总页数： | Journal of Transportation and Statistics. 2000/09. 3(2) pp1-14 (3 Fig., Refs.) |
| 报告类型： | 科技报告 |
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