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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 160. Regulation for General Conformity
12/31/2024

9VAC5-160-183. Timing of offsets and mitigation measures.

A. The emissions reductions from an offset or mitigation measure used to demonstrate conformity shall occur during the same calendar year as the emission increases from the action except as provided in subsection B of this section.

B. The department may approve emissions reductions in other years provided:

1. The reductions are greater than the emission increases by the following ratios:

Extreme nonattainment areas:

1.5:1

Severe nonattainment areas:

1.3:1

Serious nonattainment areas:

1.2:1

Moderate nonattainment areas:

1.15:1

All other areas:

1.1:1

2. The time period for completing the emissions reductions shall not exceed twice the period of the emissions.

3. The offset or mitigation measure with emissions reductions in another year shall not:

a. Cause or contribute to a new violation of any air quality standard;

b. Increase the frequency or severity of any existing violation of any air quality standard; or

c. Delay the timely attainment of any standard or any interim emissions reductions or other milestones in any area.

C. The approval by the department of an offset or mitigation measure with emissions reductions in another year does not relieve the Commonwealth of Virginia of any obligation to meet any implementation plan or federal Clean Air Act milestone or deadline. The approval of an alternate schedule for mitigation measures is at the discretion of the department, and it is not required to approve an alternate schedule.

Statutory Authority

§ 10.1-1308 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 27, Issue 11, eff. March 2, 2011.

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