SOP first.
OK, so you got dirt and dust on your cloths. DON'T USE COMPRESSED AIR.
On rare occasions, some of the compressed air can enter the blood stream through a break in the skin or through a body opening. An air bubble in the blood stream is known medically as an embolism, a dangerous medical condition in which a blood vessel is blocked, in this case, by an air bubble. An embolism of an artery can cause coma, paralysis or death. While air embolisms are usually associated with incorrect diving procedures, they are possible with compressed air due to high pressures. The consequences of even a small quantity of air or other gas in the blood can quickly be fatal.
Some employers supply a low pressure garden leaf blower for this, if not ask why not?