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MAC-values
By the obliged risk stock-taking and evaluation an employer has to investigate at which possible harmful matters its employee is exposed during its activities.Roughly this law describes that the nature, duration and the amount of exposure to a matter by employees have to be determined and approved or the concerning exposure leads till possible damage at their health.

A lower level value approved by medical research is the best instrument to establish the exposure to a specific harmful matter. The examination of the exposure according to this lower level value is an important part of the risk evaluation. By law there are published the lower level values for air (Maximum Accepted Concentration abbr: MAC).

The magnitude of lower level (MAC) value gives the matters' poisonous ness: as lower its MAC as higher its poisonous ness. Usually in toxicology the poisoned of a matter is measured by the smallest amount of particles that give health risks to human. The amount of parts of a component that will come into a body defines the seriousness of the toxically effect. How serious this can be shows this article about OPS.

For cancer raising components with genotoxically working mechanisms exists no safe threshold value. In principle is one molecule enough to cause cancer. If this really will happen, depends on the person's defend- and recovery ability. Starting-point at the assessment of marginal values for cancer raising components is the relation between the height of exposure and the (extra) risk that cancer will arise as a result of exposure. The risk of cancer is direct proportional to the concentration of the dangerous good