1. The professional contracting qualification of environmental protection engineering is divided into three levels: first-class environmental protection qualification, second-class environmental protection qualification and third-class environmental protection qualification. The six-year experience of Nanjing Environmental Protection Qualification Agency is introduced as follows.

The experience of Nanjing Environmental Protection Qualification Agency is as follows.

Second, the processing time of Nanjing environmental protection qualification has a great relationship with the bidding level. Generally speaking, the higher the bidding level of environmental protection qualification, the more requirements and the more time it takes.

Third, the higher the level of environmental protection qualification in Nanjing, the wider the scope of projects that can be undertaken.

1. The first-class environmental protection qualification can undertake the project scope: it can undertake the construction of various environmental protection projects.

2. The second-level environmental protection qualification can undertake the scope of projects: it can undertake the construction of environmental protection projects such as large and medium-sized pollution remediation projects and domestic waste treatment and disposal projects.

3. The third-level environmental protection qualification can undertake the scope of projects: it can undertake the construction of small environmental protection projects such as pollution control projects and domestic waste treatment and disposal projects.