How does conformity affect the MPO?
Under the Clean Air Act, States and MPOs must demonstrate, through the conformity process, that the transportation investments, strategies and programs they choose, taken as a whole, have air quality impacts consistent with those contained in the State Implementation Plans (SIP) for achieving the National Ambient Air Quality Standards.

If a transportation plan, program, or project does not meet conformity requirements, transportation officials have the following options:
- Modify the plan, program, or project to offset the expected emissions.
- Work with the appropriate State agency to modify the SIP to offset the plan, program, or project emissions.

If the above is not accomplished, and if a conformity determination cannot be made within certain time frames after amending the SIP, or if three years passes since the last conformity determination, a conformity lapse occurs and no new projects may advance until a new determination for the plan and Transportation Improvement Program (TIP) can be made.

Show All Answers

1. What types of pollution effect transportation planning for the Metropolitan Planning Organization (MPO)?
2. What is conformity?
3. How does conformity affect the MPO?
4. What triggers a Conformity Analysis?
5. What variables are considered when determining conformity?
6. How do emission levels determine the classification of urban areas in reference to air quality?
7. What options are available to improve air quality?
8. Why are these options necessary?
9. Why does air quality affect transportation?