A number of sanitary norms, rules and hygienic standards governing the sizes of the sanitary protection zone for a safety to human health from the harmful (chemical, biological, physical) effects of objects has been upgraded and improved. The harmonization of ambient air quality standards with international guidelines and obligations of the Republic of Belarus on international conventions has been performed. To assess the risk to public health from the impacts of a planned activity the project of instruction for the use and the algorithm of computer software for the risk assessment have been delivered.