Aviation Emissions and Air Quality Handbook  applicable implementation plan or implementation plan submission, as  appropriate, as sites of violation or possible violation.”  Furthermore, 40 CFR 93.123(b)(2) states:  “Where quantitative analysis methods are not available, the demonstration  required by § 93.116 for projects described  above must be based on a  qualitative consideration of local factors.”  Roadway dispersion modeling may be required based on other special considerations indications, thus state and regional air quality regulatory and transportation planning agencies  should be consulted.  If it is determined that a quantitative hot-spot analysis is not warranted because the project/action  does not meet the listed criteria for CO, PM$_{10}$, and PM$_{2.5}$, than a qualitative analysis should still  be considered to provide a clear demonstration that the requirements of 40 CFR 93.116 are met.  If it is determined that a quantitative hot- spot analysis is needed, the following steps should be  considered:  91 Typically those intersections with the highest traffic volumes and lowest LOS ratings are considered selected for modeling. LOS ratings measure the operating conditions at the intersection and how conditions affect traffic volume, signal timing, and related congestion delays. There are six LOS rankings: LOS  A through LOS F. LOS A is the highest ranking relating to delays of less than 10 seconds per vehicle. LOS F is  the lowest, describing operations with delays greater than 80 seconds per vehicle.  92 Exhaust, brake wear, and tire wear emissions from on-road vehicles are always to be included in a project’s  PM$_{2.5 }$or PM$_{10 }$hot-spot analysis. See Sections 4 and 5 for how to quantify these emissions using MOVES  (outside California) or EMFAC (within California).  93 Re-entrained road dust must be considered in PM$_{2.5 }$hot-spot analyses only if EPA or the state air agency has  made a finding that such emissions are a significant contributor to the PM$_{2.5 }$air quality problem in a given  nonattainment or maintenance area (40 CFR 93.102(b)(3) and 93.119(f)(8)). See the July 1, 2004 final  conformity rule (69 FR 40004).  66$_{ }$ • Estimate on-road motor vehicle emissions : 92  − Estimate emissions using EPA’s MOVES model. Additionally, for  PM$_{10 }$ and  PM$_{2.5 }$ hot-spot analyses emissions from road dust, 93,94  construction 95 , and  additional sources should be accounted for when applicable.  − Obtain model input data (i.e., meteorological) specific to project site.  − Obtain roadway configurations and geometry of critical intersections for selected  scenarios.  − Obtain traffic volumes, speeds and signal operating conditions for selected peak  time periods (i.e., morning, noon, and evening). For PM$_{10 }$and PM$_{2.5}$, more  detailed data is necessary (i.e., hourly traffic data).  • Determine approach :  − Select scenarios (i.e., no-action, project/action) and analysis year(s) for emissions  and air quality modeling.  − Select critical intersection(s) based on highest traffic volumes, worst LOS significant number of diesel vehicles generated by proposed project/action. 91  • Obtain project specific-data : 