Can an area be in conformity under the 8-hour standard, but not in conformity for the PM2.5 standard?
Yes, that is a possibility. If an area is designated nonattainment for both the 8-hour ozone standard and the PM2.5 standard, then they must meet the conformity requirements for both pollutants. For example, an area might be able to meet the requirements for ozone, but not for PM2.5. In that case, the portion of the MPO contained within the PM2.5 nonattainment would enter a conformity lapse. However, if a portion of the MPO is within the 8-hour ozone nonattainment area, but not within the PM2.5 nonattainment area, that portion would not lapse.
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?
- If a Compact area is designated nonattainment under the PM2.5 standard, do they have to meet conformity requirements?
- Isn conformity under the PM2.5 standard on a different timetable?
