Colo. Rev. Stat. § 25-7-109.1
In addition to all other powers of the commission, the commission, pursuant to section 24-4-103(6), C.R.S., shall have the authority to conduct emergency rule-making for the purpose of adopting an interim emission control regulation to apply for a specified period of time in place of an existing emission control regulation or to create an emission control regulation whenever federal regulations have been adopted and become effective pursuant to section 111 of the federal act and which add to the list of categories of stationary sources, or add new or more restrictive standards of performance for new sources, or whenever federal regulations are adopted and effective pursuant to section 112 of the federal act and which modify or adopt MACT or GACT for new or existing sources, and such regulations are required to be implemented by the states. Interim emission control regulations adopted pursuant to this section shall not be effective for a period greater than twelve months from the date of adoption.
C.R.S. § 25-7-109.1