Experimental data of the various authors who examined influence of carbon monoxide on people show that at concentration of CO 0,7 mg/l lasting 20-30 minutes blood concentration of CO reaches 12-15 %; at concentration of 1,0 mg/l and the same period of contamination - 15-19 %; at 1,8 mg/l - 27-32 %. According to standards of labor protection system such concentrations of carboxyhemoglobin in blood are intolerable. In extreme situations, however, that can happen to a person once during the life it is advisable to consider as the main objective his/her safe evacuation from a dangerous zone. According to domestic and foreign researches mentioned concentrations of carboxyhemoglobin in blood of a person do not lead to his/her disability to escape from zone contaminated with carbon monoxide on condition that he/she is protected from other combustion products. Negative after-effect of easy CO defeats caused by blood concentration of carboxyhemoglobin at a level of 15-20 % can be essentially reduced using medical means of protection - antidotes to carbon monoxide.

Comparison of statistical data for levels of carbon monoxide concentrations at fires with experimental results of researches of CO influence on human organism shows that portable self-rescuers not possessing protective properties from carbon monoxide but providing protection against other combustion products can be effectively used during 20-30 minutes approximately in 90 % of extreme situations, and in a combination to medical means are capable to protect from serious defeats in greater number of situations.

But once again we have to emphasize the necessity of development of the documents regulating standards and rules of use for the system of self-rescuers for population that should reflect objects and situations demanding higher levels of protection including carbon monoxide protection.

5. Size range of self-rescuers

Research and operating practice for PSERA shows that the highest efficiency of its use is reached if their design allows to select and adjust samples according to specific features of the user. The chance to implement such approach into designs of self-rescuers for population is rather short, the most acceptable are technical decisions directed on development of products of the unified sizes for people with different geometrical sizes of face, neck, having moustaches, beards, long hair, using glasses.

Two sizes are also possible but in this case simple and clear criteria of their choice, for example, products for children from 7 to 14 years old and adults should be defined. In this case, however, rather desirable property is their interchangeability. Any product should be designed for any user; discrepancies in size can lead to less convenient use but not to loss of the basic protective properties.

Accessories for adjustment of the product can be elements of design but if the consumer did not found use for them protective properties of the self-rescuer should remain solid.