Practices for Project-Level Analyses for Air Quality (2021) / Chapter Skim
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Pages 14-27
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14 A survey was developed to get a snapshot of current practices of DOTs with respect to projectlevel air quality issues. The survey consisted of 50 questions and was designed to query all aspects related to project-level air quality.
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Survey of DOTs 15 possible questions and follow-up to their responses. At locations within the survey, a few (two to five)
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16 Practices for Project-Level Analyses for Air Quality Findings and Observations The survey contained some questions that were sequential and dealt with similar topics or themes. Other questions covered topics that were independent of other questions but delved into important topics related to project-level air quality analysis.
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Survey of DOTs 17 used. Guidance is typically what should be done, whether at the state or federal level, and procedures are the step-by-step description of how to do the analysis.
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18 Practices for Project-Level Analyses for Air Quality Traffic surveys are used to measure existing conditions (e.g., vehicle mixes or operating conditions) and to validate the traffic models (Colorado, Delaware, the District of Columbia, Georgia, Illinois, and New York)
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Survey of DOTs 19 Georgia, for example, scopes for worst-case, detailed analysis level of effort in order to avoid having to re-scope the project efforts, requiring additional procurement time. This does not directly mean that this level of analysis is required or expected, but the scope is covered in the case that it does occur.
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20 Practices for Project-Level Analyses for Air Quality on air quality and environmental issues, including assuring that projects are properly listed on the TIP for transportation conformity analyses, and keeping track of the latest developments regarding MSATs. Nevada and FHWA were previously sued with regard to MSATs on one of its projects.
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Survey of DOTs 21 consultants doing the majority of the analyses. The percentage done by consultants varies widely among the DOTs, ranging from 99% to 30%.
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22 Practices for Project-Level Analyses for Air Quality Air Quality Analysis Procedures Of the 40 DOTs responding to the survey, 23 (57.5%) report that they do not have written air quality analysis procedures for their area.
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Survey of DOTs 23 Based on their procedures, the DOTs that responded to this question (15) estimate that within the last 5 years, they have done the following amount of project-level air quality analyses.
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24 Practices for Project-Level Analyses for Air Quality the possibility that such a need could conceivably arise but are not expecting to have to do one. One state (Wisconsin)
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Survey of DOTs 25 With regard to background data, most DOTs (nine DOTs of the 15 responding to this question, or 60%) obtain background data from the air quality agency, using the nearest air quality agency monitoring site, typically using the average of the previous 3 years of data.
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26 Practices for Project-Level Analyses for Air Quality but which had not been doing conformity for some years. In general, the DOTs are viewed as the "go-to" agency for transportation issues outside the typical conformity situation (e.g., TIP or plan conformity determination)
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Survey of DOTs 27 they were on staff. Also, there may be incomplete knowledge on some issues.
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