Based on the degree of harm that may be caused by the pollution incident, the degree of urgency and the development of the situation, the level of environmental pollution emergencies are generally divided into four levels: Ⅰ (mega), Ⅱ (major), Ⅲ (major) and Ⅳ (general) Early Warning Level Classification Criteria: (a) Ⅰ (mega): the occurrence of more than 30 deaths, or poisoning (serious injuries) of 100 people (a) Level Ⅰ (mega): the occurrence of more than 30 deaths, or poisoning (serious injury) of 100 people; due to environmental events need to evacuate, transfer the masses of more than 50,000 people, or more than 10 million yuan of direct economic losses; serious loss of regional ecological functions or endangered species living environment has been seriously contaminated; because of the environmental pollution of the local normal economic and social activities have been seriously affected; the use of radioactive substances for man-made destruction of the incident, or the loss of control of the 1, 2 types of radioactive sources caused by a large range of serious radiation pollution; due to environmental pollution caused by the major water sources of important cities Environmental pollution caused by the major water sources in important cities to interrupt the water pollution accidents; due to the production of hazardous chemicals (including highly toxic) production and storage and transportation of leakage, seriously affecting the people's production and life of the pollution accidents (b) Level Ⅱ (major): the occurrence of more than 10 people, the death of less than 30 people, or poisoned (serious injuries) more than 50 people, less than 100 people; the regional ecological function of the loss of part of the endangered species or the survival of the environment is contaminated; due to environmental pollution of more than 10 people, 30 people died, or poisoning (serious injury) more than 50 people, less than 100 people; part of the loss of regional ecological function or Survival of the environment is contaminated; due to environmental pollution so that the local economy, social activities are greatly affected by the evacuation and transfer of more than 10,000 people, 50,000 people; 1, 2 types of radioactive sources lost, stolen or out of control; due to environmental pollution caused by the pollution of important rivers, lakes, reservoirs in large areas, or county-level towns and cities above the interruption of water withdrawal of the pollution accident (C) Level Ⅲ (larger): the occurrence of more than 3 people, less than 10 people Death, or poisoning (serious injury) of 50 people or less; caused by environmental pollution across the prefecture-level administrative disputes, so that local economic and social activities are affected; 3 types of radioactive sources lost, stolen or out of control (d) Ⅳ (general): the occurrence of three deaths or less; caused by environmental pollution across the county-level administrative disputes, causing general group impact; 4, 5 types of radioactive sources lost, stolen or out of control