Before the Clean Air Rule's emissions reductions could begin taking effect, a 2018 court ruling suspended the rule.
On Jan. 16, 2020, the Washington State Supreme Court upheld the portions of the rule that applied to facilities and other fixed soures, but found other portions invalid. The Supreme Court remanded the case to Thurston County Superior Court to determine how to separate the rule.
Although the Clean Air Rule is currently suspended, facilities covered by the Clean Air Rule still are required to report their emissions for the Greenhouse Gas Reporting program. This reporting program is required by Washington law.