about Lanzhou Environmental Impact Assessment Report Introduction to knowledge points written:
1. Environment: the overall external world with human society as the main body, which includes various natural and social factors that have been recognized and not yet recognized by human beings and that directly or indirectly affect human survival and social development.
2. Environmental impact: refers to the environmental changes caused by human activities and the resulting effects on human society. It includes two levels: the effect of human activities on the environment and the reaction of the environment to human society.
3. Environmental impact assessment: refers to the systematic identification, prediction and assessment of the possible impact (consequences) on the environment after the implementation of the proposed construction project, regional development plan and national policies. And put forward countermeasures and measures to prevent and mitigate adverse environmental impacts, providing scientific basis for decision-making.
4. Environmental impact assessment system: it is a system that must be followed after the environmental impact assessment work is determined in the form of laws, regulations and administrative rules.

5. The meaning of comprehensive environmental impact assessment: according to a certain assessment purpose, the impact of human activities on the environment is generally integrated, and the environmental impact is qualitatively or quantitatively assessed
6. Unorganized emission; It refers to the irregular emission of waste gas pollutants during the production and operation of the production plant without passing through the exhaust funnel or the emission source with the exhaust funnel less than 15m.
7. Air pollution source: a device that can release pollutants into the atmosphere (refers to the facilities or building structures that discharge atmospheric pollutants
8. Atmospheric environmental capacity: the total amount of atmospheric pollutants allowed to be discharged in a given area to meet the environmental air protection objectives.
9. Ecological impact assessment: determine the ecological load or environmental capacity of a region by quantitatively revealing and predicting the ecological impact of human activities on human health and economic development.