When does the three-year conformity update clock begin for an area that relies on a previous regional emissions analysis?
A new plan/TIP conformity determination based on a completely new regional emissions analysis is required every three years from the date of FHWA/FTA’s determination. If a conformity determination relies on any part of a previous regional emissions analysis, the frequency requirements of 40 CFR 93.104(b) or (c) are not satisfied. Q7: If the previous regional emissions analysis did not analyze the 8-hour attainment year, can the MPO rely on the previous regional emissions analysis for the other analysis years required, and only perform a new analysis for the 8-hour attainment year? A: No. However, if nothing else has changed for those analysis years and the previous analysis for those years is exactly what would be generated if a new analysis was performed (i.e., the latest planning assumptions and emissions models have not changed), the modeling for those analysis years would not have to be repeated. In other words, if there have been no changes in the area’s plan and TIP, and more rec
Related Questions
- Can an MPO rely on a previous regional emissions analysis, or portion thereof, conducted for a 1-hour ozone conformity determination to determine conformity for the 8-hour ozone standard?
- If an area voluntarily determines 8-hour conformity early, would that start the three-year update clock?
- Who is responsible for conducting the regional emissions analysis for a donut area?
