Where do I find the most up to date information on what is required by businesses, per industry, now that the State has lifted mask mandate?
You can find guidance via the CDPH COVID Guidance links for employers and workplaces https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/Guidance.aspx
Also the covid19.ca.gov website https://covid19.ca.gov/masks-and-ppe/#Guidance-for-businesses
As well as CalOSHA ETS https://www.dir.ca.gov/dosh/coronavirus/
All of these websites have the most updated guidance for businesses and employers.