ECHA 是否仅对需要风险管理的危险物质进行分组和评估，还是也对目前不需要采取进一步行动的危险性较低的物质进行分组和评估？

ECHA 是否仅对需要风险管理的危险物质进行分组和评估，还是也对目前不需要采取进一步行动的危险性较低的物质进行分组和评估？

Does ECHA only group and assess hazardous substances that need risk management or also less hazardous ones that need no further action at present?

物质分组基于化学结构的相似性，涵盖已知/可能存在危害的物质，以及目前未知或怀疑存在危害的物质。ECHA 可能先处理（潜在）危险物质，然后再处理不太可能存在危害的物质，但对化学物质进行系统性分组最终将涵盖所有 REACH 注册物质。

Groups are formed based on similarity of chemical structures and cover both substances with known/ likely hazards and substances not currently known or suspected to be hazardous. ECHA may address (potentially) hazardous substance earlier than substances with unlikely hazards, but the systematic grouping of the chemical universe will address all REACH registered substances eventually.