Between a 911 call and the arrival of paramedics and an ambulance, a crucial difference to an accident victim’s recovery on a construction site can be made by the immediate onsite availability of trained employee-responders with the right first-aid equipment and supplies.
To make sure it is safe for you to wear a respirator, your employer must pay for you to have a medical evaluation (unless you’re using a disposable dust respirator that is not required). You may be asked to fill out a questionnaire for a doctor or health care practitioner to check.