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“It is more important than ever that California and all other states that rely on Clean Air Act waivers continue to cut tailpipe pollution through homegrown, health-protective policies.”

In recent months, Trump has escalated his California-specific efforts, including vowing to block the state’s ability to set strict tailpipe emission standards — a battle that has wound all the way up to the Senate.

The “State of the Air” report tracks two main types of air pollution: ozone pollution, largely a factor of tailpipe emissions and heat, and particle pollution, driven primarily by drought and wildfires.

The 31 regulatory actions are also occurring alongside job cuts and efforts to curtail California’s authority to set tailpipe emissions.

Based on that change, Trump’s EPA revoked the state’s legal waiver from the EPA, preventing it from enforcing its tailpipe emissions standards.