Skimming that website, whoever is maintaining that is being...very generous with themselves about what they mark as "completed", to put it mildly. For example, "Roll back goal of haze reduction (visible air pollution)" is marked as complete, with the source being an EPA article [1] saying "[the EPA] is reconsidering its implementation of the Clean Air Act’s Regional Haze Program", but no indication of what is being reconsidered, or if anything is actually done.
Putting all of that together with the claimed 46% number, I guess you can count me as a fool. But I'm not buying the hysteria here, sorry.
[1] https://www.epa.gov/newsreleases/administrator-zeldin-begins...