(a) The commission shall adopt grant guidelines and criteria consistent with the requirements of this chapter.
(b) Guidelines must include protocols to calculate projected emissions reductions, project cost-effectiveness, and safeguards to ensure that funded projects generate emissions reductions not otherwise required by state or federal law.

(c) The commission shall make draft guidelines and criteria available to the public and the United States Environmental Protection Agency before the 30th day preceding the date of final adoption and shall hold at least one public meeting to consider public comments on the draft guidelines and criteria before final adoption. The public meeting shall be held in the affected state implementation plan area, and if the guidelines affect more than one state implementation plan area, a public meeting shall be held in each affected state implementation plan area affected by the guidelines.
(d) The commission may propose revisions to the guidelines and criteria adopted under this section as necessary to improve the ability of the plan to achieve its goals. Revisions may include, among other changes, adding additional pollutants, adding stationary engines or engines used in stationary applications, adding vehicles and equipment that use fuels other than diesel, or adjusting eligible program categories, as appropriate, to ensure that incentives established under this chapter achieve the maximum possible emissions reductions. The commission shall make a proposed revision available to the public before the 30th day preceding the date of final adoption of the revision and shall hold at least one public meeting to consider public comments on the proposed revision before final adoption.
(e) Because the legislature finds that the current state of air quality in the state jeopardizes the state’s ability to meet federal air quality requirements, the commission and the comptroller may adopt emergency rules under § 2001.034, Government Code, with abbreviated notice, to carry out any rulemaking necessary to implement this chapter.
(f) Except as provided by Subsection (e), the rulemaking requirements of Chapter 2001, Government Code, do not apply to the adoption or revision of guidelines and criteria under this section.