OSHA (Occupational Safety and Health Administration) regulations on ozone

  *OSHA Permissible Exposure Limit (PEL) guidelines for O3 in the workplace are based on time-weighted averages (TWA). 0.1 ppm for 8 hour work shift for a 40 hour work week.*

 -OSHA requires that if you are generating ozone that you measure this ozone level for safety purposes

 -The OSHA website cites the following exposure limits for ozone in the workplace:

     *0.1 ppm PEL for 8 hours per day (TWA) exposure for General Industry

     *0.1 ppm PEL for 8 hours per day (TWA) exposure for Construction Industry

     *0.1 ppm PEL for 8 hours per day (TWA) exposure for Shipyard Employment

     *0.3 ppm Short Term Exposure Limit (STEL) for a 15 minute time weighted average (TWA) exposure which is not to be exceeded at any time during a workday even if the time-weighted average is below the PEL.

 

Below is the calculation that can be used for the cumulative exposure for the 8 hour work shift:

          (Ca Ta+Cb Tb+. . .Cn Tn)÷8 = E
     *E is the equivalent exposure for the working shift. (Ozone = 0.1 ppm)
     *C is the concentration during any period of time (T) where the concentration remains constant.
     *T is the duration in hours of the exposure at the concentration C.

  For example:
          ([0.5ppm x 1 hour] + [0.02 x 2 hours] + [0.052ppm x 5 hours]) ÷ 8 = 0.1 ppm

Ozone levels can be higher than the 0.1ppm standard for a short period of time as long as low levels at other times of the day still equal out to 0.1ppm of ozone over the 8 hour shift.

  For example (0.1 all day):
          (0.1ppm x 8 hour) ÷ 8 = 0.1

When using this calculation the value of E should never exceed 0.1 ppm of ozone in an 8 hour work shift.

For more information see https://www.osha.gov/chemicaldata/9

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