1. You can go to the environmental protection department where the excavator is located, provide the license plate number or environmental protection number of the excavator, and ask the staff for license plate information. Environmental protection departments generally have corresponding databases, which can query the detailed information of environmental protection licenses of excavators.
2. Environmental protection departments in some areas have provided online inquiry platforms. You can enter the excavator license plate number or environmental protection number on the website to inquire about the license plate information.