Less than a week after China shook up the global recycling industry with its announcement of a scrap import ban, details are thin and the possibilities are vast.

According to a July 18 filing with the World Trade Organization (WTO), the country will stop accepting four classes and 24 categories of “solid waste” by the end of the year. That includes multiple types of plastics, textiles, mixed fibers and other materials. The exact specifications of what will be rejected are still being investigated, but it’s clear that China will be accepting less material. Minimal rationale was provided in the Ministry of Environmental Protection’s WTO filing aside from concerns about pollution from “foreign garbage” imports.

“To protect China’s environmental interests and people’s health, we urgently adjust the imported solid wastes list, and forbid the import of solid wastes that are highly polluted,” read the filing.