Practices for Project-Level Analyses for Air Quality (2021) / Chapter Skim
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From page 6... ...
6 Introduction The literature review for this study was designed to uncover and describe studies and reports that would be of maximum value to DOT air quality practitioners. In other words, information was identified that could be used by air quality practitioners to • Apply federal or state guidance or regulations in an effective and thorough manner, • Streamline or simplify project-level air quality studies, • Address issues that could assist them in dealing with select air quality topics, • Obtain particularly complete and comprehensive examples of dealing with one or more pollutants typically encountered by DOTs, and • Identify gaps in addressing project-level air quality issues that could be resolved by additional guidance or research.
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From page 7... ...
Literature Review 7 Project 20-07/Task 060: "Support for Implementing the Clean Air Act Amendments of 1990") , traffic flow projects (NCHRP Project 25-21 and NCHRP Report 535: Predicting Air Quality Effects of Traffic-Flow Improvements: Final Report and User's Guide)
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8 Practices for Project-Level Analyses for Air Quality The study examined a number of DOT air quality analysis procedures and the use of air quality programmatic agreements by DOTs. It found that, of the procedures reviewed, there was a wide range of specificity with regard to analysis triggers, detail in modeling inputs, analysis years, meteorology, or other parameters of project-level air quality analysis.
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Literature Review 9 discusses challenges the practitioner may encounter in applying local data in MOVES (e.g., state vehicle registration data mapping into the MOVES source types)
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10 Practices for Project-Level Analyses for Air Quality Templates for Project-Level Analysis Using MOVES, CAL3QHC/R and AERMOD – NCHRP Project 25-25/Task 71 Final Report The purpose of the study was to develop a project-level air quality technical report template that could be used by DOTs to reduce time and resources spent developing an air quality report, improve the quality and consistency of these reports, and help DOTs meet new modeling requirements. The templates were designed to meet the transportation conformity and NEPA needs of the states.
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From page 11... ...
Literature Review 11 quality staff person through the entire modeling and documentation chain for a transportation project. The guidebook includes an overview of the analysis procedure, information on estimating the level of effort required for an analysis, guidance for reviewing and verifying AERMOD modeling results, a discussion of potential mitigation measures, and guidance for developing and streamlining PM hot-spot analysis documents.
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12 Practices for Project-Level Analyses for Air Quality • The impacts of transportation project alternatives on MSAT concentrations are generally small relative to background levels of pollutants (5% to 15% in the case examples conducted for this research)
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Literature Review 13 It has a checklist of factors and issues for determining the applicability of various air quality requirements and how to address them in a NEPA document with clarity and completeness. These include such issues as • Description of pollutants considered, • Regulatory requirements, including transportation conformity, • Existing conditions (baseline)
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