Many went without masks. Some had water spurting from their machines, but others had nothing to tamp down the powder rising in the air. Does OSHA not require masks in these cases?
A key insight into things like this is that many regulations are like speed limits: loosely enforced. Sometimes because it is too hard to inspect every shop handling dangerous materials. In cases like these you have to ban the dangerous material, or essentially kill the market for the products that use it. BTW, I'm not sure how solid granite, soapstone, marble, etc. would be any better. Maybe my 30 year old totally f…
There's a OSHA/NIOSH pamphlet linked through the original article (https://www.osha.gov/sites/default/files/publications/OSHA37...) with table and additional details.
The pamphlet said that in one study, a marble shop performing dry grinding (no wetting, nor other engineering controls) had airborne silica levels of 39-45 ug/m3, while a granite shop which also did not use engineering controls say 89-460ug/m3.