[PDF] Implications Of Using Real Time And Estimated Speed Data In Air Quality Analyses eBook

Author : John Sanders Miller
Publisher :
Page : 27 pages
File Size : 37,91 MB
Release : 2002
Category : Air quality
ISBN :

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A speed post-processor refers to equations or lookup tables that can determine vehicle speeds on a particular roadway link using only the limited information available in a long-range planning model. An estimated link speed is usually based on volume, the percentage of heavy trucks, the free flow speed on the link, and the facility type (e.g., interstate, two-lane highway). These post-processed speeds are used to estimate motor vehicle emissions in conjunction with the U.S. Environmental Protection Agency's MOBILE model. At least two post-processors in the form of software packages are available to VDOT staff. One, developed by Michael Baker Jr., Inc., can be used immediately with minor modifications as an interim measure to perform conformity analyses for new nonattainment areas. The other is being updated by VDOT's Northern Virginia District; a new generation is expected within a few months. Another option is for VDOT staff to code speed-volume equations directly into a spreadsheet, as has been done in the Appendix. The authors recommend that over the next 12 months, either the Research Council, VDOT, or the two organizations work together to validate the post processors available by comparing their computed and actual speeds on a variety of facility types. In conjunction with this effort and to the extent that resources allow, the effect of different input data, such as vehicle age, vehicle type, and travel speeds, on mobile source emissions as predicted by the MOBILE model should be studied.

Author : National Research Council
Publisher : National Academies Press
Page : 553 pages
File Size : 27,81 MB
Release : 1981-01-01
Category : Medical
ISBN :

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Discusses pollution from tobacco smoke, radon and radon progeny, asbestos and other fibers, formaldehyde, indoor combustion, aeropathogens and allergens, consumer products, moisture, microwave radiation, ultraviolet radiation, odors, radioactivity, and dirt and discusses means of controlling or eliminating them.

Author : Jessica Lincoln-Oswalt
Publisher :
Page : 0 pages
File Size : 50,61 MB
Release : 2011
Category : Air
ISBN : 9781614707240

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The authorities and responsibilities of the Environmental Protection Agency (EPA) derive primarily from a dozen major environmental statutes. This book provides a concise summary of one of those statutes, the Clean Air Act. It provides a brief history of federal involvement in air quality regulation and of the provisions added by legislation in 1970, 1977 and 1990. It also explains major authorities contained in the Act as well as key terms and references for more detailed information on the Act and its implementation.

Author : Nicolas Moussiopoulos
Publisher : Springer Science & Business Media
Page : 320 pages
File Size : 21,86 MB
Release : 2013-11-11
Category : Science
ISBN : 3662052172

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Urban areas are major sources of air pollution. Pollutant emissions affecting air quality in cities are considered to have adverse consequences for human health. Public and government concern about environmental issues arising from urban air pollution has increased over the last decades. The urban air pollution problem is widespread throughout the world and it is important to find ways of eliminating or at least reducing the risks for human health. The fundamentals of the physical and chemical processes occurring during air pollutant transport in the atmosphere are nowadays understood to a large extent. In particular, modelling of such processes has experienced a remarkable growth in the last decades. Monitoring capabilities have also improved markedly in the most urban areas around the world. However, neither modelling nor monitoring can solve urban air pollution problems, as they are only a first step in improving useful information for future regulations. The defining of efficient control strategies can not be achieved without a clear knowledge of the complete pollution process, i.e. emission, atmospheric transport and transformation, and deposition at the receptor. Improving our ability to establish valid urban scale source-receptor relation ships has been the objective of SA TURN, one of the 14 subprojects of EURO TRAC-2. Similar to the other subprojects of this co-ordinated environmental pro ject within the EUREKA initiative, SA TURN brought together international groups of scientists to work on problems directly related to atmospheric chemistry and physics. The present volume summarises the scientific results of SATURN.