Abstract
According to Polish regulations establishments other then upper- or lower-tier, can be potentially responsible for the major accidents. This establishments will be called non-Seveso establishments. In the publication, non-Seveso establishments were defined, types of this establishments and substances present in them were described. Computer simulation was used to made a series of forecasts of possible consequences of release of substances, present in non-Seveso establishments, in major accident cases. In these establishments, take place the considerable number of the accidents, and accident index is approximately 2.5 times higher for non-Seveso establishments than for Seveso ones. The National Labour Inspectorate inspections, in that kind of establishments, showed insufficient management in the area of major accident hazard.
