Reading [1] about the regulations, it sounds like the only requirement (for self contained air cleaners) is that it has to be certified, and can't produce ozone. That seems pretty painless, and I would like the comfort of knowing that if I buy an air cleaner, it actually does what it says. Same as masks should have testing requirements to show efficacy.
[1] https://ww2.arb.ca.gov/our-work/programs/air-cleaners-ozone-...