How do I carry out a COSHH assessment for a substance that does not have a Safety Data Sheet, for example dust?

Some substances are process generated, for example wood dust produced from sawing wood. Employers should regard a substance as hazardous to health if it is hazardous in the form in which it occurs in the work activity. You should find out if there are any health effects associated with working with the hazardous materials identified and look at how workers could be exposed, for example do you use a dry brush to sweep up dust? Use this information to evaluate risks to health and minimise exposure by taking sensible measures, such as using a vacuum cleaner instead of a brush, or keeping lids on containers. How do I carry out a COSHH risk assessment? provides more information