Does a conformity determination for the 8-hour ozone standard or the PM2.5 standard need to be accompanied by conformity determinations for other applicable pollutants?
Not necessarily. As long as the transportation plan/TIP have not been updated or amended, a conformity determination for the 8-hour or PM2.5 standard would not need to address other pollutants for which the area might be nonattainment or maintenance. However, plan/TIP update requirements, as well as the frequency requirements of 40 CFR 93.104(b), (c), and (e) for the other pollutants, would still apply. In other words, the 8-hour or PM2.5 conformity determination in this case would not satisfy the plan/TIP update frequency requirements of the planning regulations (23 CFR 450), nor the frequency requirements of 40 CFR 93.104(b), (c), or (e) for the other applicable pollutants.
Related Questions
- Does the conformity guidance for multi-jurisdictional areas apply only to the 8-hour standard, or does it also apply to PM2.5 and other standards?
- Can an area be in conformity under the 8-hour standard, but not in conformity for the PM2.5 standard?
- Isn conformity under the PM2.5 standard on a different timetable?
