In order to make the hazard identification of substances more operational and lay a foundation for environmental risk assessment

the hazard identification of substances is sorted out according to HJ 169—2018 and in combination with years of work experience. The hazardous substances are divided into flammable and explosive substances and toxic and hazardous substances

and six material hazard identification standards are listed. The four steps of material hazard identification are established from material statistics

material property inquiry

screening of hazardous substances

determination of critical quantity and calculation of Q value. Through the identification cases of hazardous substances in actual projects

the list method is proposed to comprehensively identify hazardous substances and calculate the maximum quantity of hazardous substances. The methods and approaches to reasonably determine the critical quantity and the key points in the hazard identification of substances are given. Discusses the identification of hazardous substances from the classification of substances

identification standards

identification procedures and identification points.