The registration address of dong chong city environmental engineering ltd. Is located at the 6th pavilion of yancheng road, yan chongshan township, east chang city. The registration authority is the market supervision authority of dong chong city, represented by a legal person, and includes environmental engineering design, construction, installation and commissioning; environmental technical services and advice; environmental pollution management technical services; agent environmental protection declaration procedures; development, sale: energy conservation equipment, water treatment equipment, air purification equipment, environmental protection materials and water purification materials. (projects subject to legal approval are not allowed to operate without the approval of the relevant authorities) i'm not sure