An agency shall discontinue payment of hazard pay differential to an employee when—
    
    
        
        (a) 
         One or more of the conditions requisite for such payment ceases to exist;
     
    
        
        (b) 
         Safety precautions have reduced the element of hazard to a less than significant level of risk, consistent with generally accepted standards that may be applicable, such as those published by the Occupational Safety and  Health Administration, Department of Labor; or
     
    
        
        (c) 
         Protective or mechanical devices have adequately alleviated physical discomfort or distress.
     
    
        
            Code of Federal Regulations
        
        [56 FR 20345, May 3, 1991, as amended at 59 FR 33417, June 29, 1994]