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28 <br />4.0.2 Emissions analysis source <br />Vehicle Miles of Travel (VMT) and speeds for the emissions analysis were derived from the <br />TRM where it is available. Person County VMT and speeds came from the NCDOT rural <br />spreadsheet; VMT and speeds for the portions of Franklin, Granville and Johnston Counties <br />outside the modeled area came from the NCDOT rural spreadsheet factored by the percentage of <br />each county's population in the rural azea, a method that has been used in prior analyses. <br />4.0.3 Emissions comparison years (ozone) <br />For areas with budgets under the 8-hour standard (Durham, Franklin, Granville, Johnston, . <br />Orange, Person and Wake Counties and the four townships in Chatham County), emissions must <br />be analyzed for years where there is an 8-hour emissions budget, the attainment year (if a region <br />is in non-attainment), the horizon yeaz and intermediate years such that intervals do not exceed <br />10 years. The Triangle azea is currently in attainment, so no attainment year analysis is <br />required. The following years were analyzed to meet the requirements: 2015 (intermediate <br />year), 2017 (8-hour budget yeaz), 2025 (intermediate yeaz), and 2035 (LRTP horizon yeaz). <br />Analysis years where there is a budget and no LRTP model runs, do not require additional runs; <br />interpolation was used to derive data for the non-matching yeaz (2017). Also, in accordance <br />with 40 CFR 93.118, since there was no budget for the required analysis years 2015, 2025 and <br />2035, the 2008 budgets were used for 2015 analysis and the 2017 budgets were used for 2025 <br />and 2035. <br />20 <br />