Comment by atombender

California wants a ban because they specifically think safety standards are not sufficient [1]:

  California’s ban would be an acknowledgment that the state’s laws
  requiring safer processing techniques for quartz are not enough to
  protect workers: Compliance is too low and the industry too
  fragmented, with many small shops that escape inspection, according
  to the California Department of Industrial Relations, which has
  pushed for the ban.

[1] https://www.nytimes.com/2026/10/05/us/politics/quartz-counte...