On this website you can find more information about the source strengths for different operations, such as grinding, chopping, drilling for various carcinogens.
In the left menu bar you can choose from different materials:
The following TNO Publications show an overview of the current legal limits of respirabel quartz and wood dust (hardwood).
Also, the excess factors, compared to these limit values, are mentioned for dozens of carcinogenic processes.
These excess factors range from 15 to 5,000 times thelinit value of respirabel quartz and from 10 to 140 times the limit value of wood dust.