unit III

 Perform the following calculation for air concentration. Acetone: 42.0 ppm = ____ mg/m3

 Perform the following calculation for air concentration. Sulfuric Acid: 2.5 mg/m3 = ____ ppm 

 Perform the following calculation for air concentration. Formaldehyde: 4.0 mg/m3 = ____ ppm 

Perform the following calculation for air concentration. Benzene: 3.0 ppm = ____ mg/m3

 Discuss the similarities and differences that exist between the three basic types of occupational exposure limits (OELs). Describe how each type of OEL is used to control occupational exposures, and provide at least one specific chemical for which each type of OEL has been established. 

Your answer must be a minimum of 200 words in length. 

 Discuss the common elements used to derive occupational exposure limits (OELs). Provide your opinion as to which of the elements is the most important.

Your answer must be a minimum of 200 words in length  

 Describe how hazard notations are used to derive OELs, including the additional hazard notations included by the Occupational Safety and Health Administration (OSHA). How would these notations be used in industrial hygiene practice? 

Your answer must be a minimum of 200 words in length. 

Unit III journal

 Imagine that you are an industrial hygienist or a safety officer at an organization. Describe how you would determine which occupational exposure limits (OELs) should be applied at your workplace. Should you use the Occupational Safety and Health Administration (OSHA) permissible exposure limits (PELs), the American Conference of Governmental Industrial Hygienists (ACGIH) threshold limit values (TLVs), or the National Institute for Occupational Safety and Health (NIOSH) recommended exposure limits (RELs)? Explain which one you would choose and why.

Your journal entry must be at least 200 words. No references or citations are necessary.