EURO-ECO 2010 Hanover 2 - 3 Dezember 2010	Environmental, Engineering - Economic and Legal Aspects for Sustainable Living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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Working conditions of people are to be safe. Besides, a human being needs a feeling of comfort (ecological compatibility of a working place). Obviously, the only way to create comfortable environment is to normalize factors that are perceived by human sense organs.

In our research we have analyzed assessment criteria and estimated each factor share, as a result we have offered the following mathematical model (1):

where K – working conditions quality index; Hi – assessment of working process factors and working environment quality; m_i – number of working process and environment factors.

We have elaborated the following formula (2) to calculate working process factors quality (heaviness and intensity of work):

where P – working conditions criteria; N – degree of dependence on index category, measured in points; m_n – number of working process factor indices; k – empirical coefficient.

In a similar way we have analyzed criteria of microclimate and illumination environment and worked out algorithms of microclimate comfort index and illumination environment comfort index calculation as well as elaborated mathematical models allowing to describe interaction in the system “working conditions – human health”. This makes possible to determine how comfortable a worker feels in certain microclimatic conditions and illumination environment, which parameters influence a worker and to which extent they do.

To assess microclimate comfort there is model 3:

Where H – microclimate comfort index; n – number of assessment criteria for each microclimate parameter; N_ji – point given to each microclimate parameter (according to five-point system in proportion to each index share); k_j – comfort coefficient according to microclimate parameters; j – total number of indices; P_ji – assessment criteria in ascending order in proportion to working conditions class.

To assess illumination environment comfort there is model 4:

Where H – illumination environment comfort index; n – number of illumination assessment criteria; N_ji – point given to each parameter of illumination (according to five-point system in proportion to each index share); k_j - comfort coefficient according to illumination parameters; j

-total number of indices; P_ji - assessment criteria in ascending order in proportion to working conditions class.

This method can be used during ISO standards implementation in an enterprise because certification process includes the following elements (at the level of individual executors and departments as well as at the level of enterprises): activity planning, analysis and results assessment, controlling, error correction, documenting, storing documents, staff training and financing of works which correspond to quality management system according to ISO standards terminology.