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Introduction. Prevention of occupation hearing loss should be based on mathematical models and computational methods to predict changes in hearing thresholds (HT) with age and under the action of noise on the hearing organ. There is an urgent need for quantitative methods to determine the health risk of exposure to noise above 80 dBA.The aim of the study was to determine the group excessive risk of hearing loss (ERHL) under the action of noise using the model of the third edition of ISO 1999.Materials and methods. Developed technology for the determination of the HT model, the third edition of ISO 1999, depending on the gender, age, length of service and experienced noise exposure on the basis of the related sett lement tables MSExcell for population percentiles 1 to 99% in 1% step. Results. With the use of the developed technology, the initial data were determined and the main indicators of the group risk of hearing loss at the levels of criteria for the diagnosis of sensorineural hearing loss (SNT) were calculated. Th eir dependences on age, length of service and noise level are calculated.Conclusions: Th e developed technology allows us to calculate the probable hearing thresholds of the quantile of the population exposed to and unaff ected by noise and the magnitude of the group excess risk.

The intensity of civil aircraft flights elevates with the increase in the number of passenger and cargo transportation by air. Aircraft noise in the residential area near airports grows up too despite the use of low-noise aircraft models by airlines. This causes an augmentation in the number of complaints of the population in these areas. The Russian Federation’s normative and methodological documents requirements in force relating to measurements and assessment of noise in residential areas, including «aircraft noise», were analyzed. Their requirements in terms of measuring and assessing noise in residential areas, including “aircraft noise”, testifies to the insufficiency and ambiguity of these requirements. The main disadvantages are the lack of a clear definition of which sound event is considered «aircraft noise» and the lack of requirements for the duration of the reference time interval of noise measurement. The foreign experience of measuring and evaluating aircraft noise, as well as the effects of such noise on the population, are considered. This made it possible to determine the necessary and sufficient parameters for noise control in residential areas, including «aircraft noise». There were proposed both a definition of «aircraft noise» and the necessary parameters for its assessment. The necessary duration of the reference time interval for the measurement of normalized parameters was justified. Method for the normalized noise parameters in residential areas measurement using the chronograms of sound levels A was proposed. The technical implementation of such a method is presented. Proposed a definition of «aircraft noise» and measuring normalized parameters in the 15-minute reference time interval for inclusion in regulatory and methodological documents will help to eliminate ambiguity in measurements and noise assessment in residential areas.

Introduction. Revision of the "Guidelines for the hygienic assessment of factors of the working environment and the labor process. Criteria and classification of working conditions" R 2.2.2006-05 determined the relevance of improving hygienic criteria and classification of working conditions, including noise, based on a risk-based approach. The study aims to substantiate risk-oriented hygienic criteria and classification of working conditions by noise, taking into account the group attributive (excessive) risk of hearing loss. Materials and methods. The researchers carried out an expert-analytical study and calculations of the attributive risk of hearing loss under the influence of noise. The authors used a technology (ARHL) according to the model of the third edition of the ISO 1999 standard. We performed the calculation of ARHL using several variants of the average values of hearing thresholds at various combinations of audiometric frequencies. Results. Scientists have substantiated a risk-oriented criteria and classification of working conditions depending on noise levels, taking into account the equal energy rule (q=3) and the data of the group attributive risk of hearing loss. Conclusion. We substantiated a risk-oriented hygienic criteria and classification of working conditions by noise, harmonizing the hygienic assessment of the noise risk factor with international practice. Ethics. In preparing the article, the authors guided by the Ethical principles of medical research set out in the Helsinki Declaration of the World Medical Association of the last revision. Limitation of studies. There are the features of the model for assessing hearing loss due to noise exposure according to GOST R ISO 1999:2013.

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