美国环保署化学数据库统一检索接口Envirofacts(免费)
Envirofacts是检索美国环保署EPA与环境有关(影响美国本土的空气、水、土壤等)的化学数据的集成检索接口。

美国环保署EPA的物质登记数据库SRS (原为Chemical Registry System, CRS)
Substance Registry Services (SRS) is the Environmental Protection Agencys (EPA) central system for information about substances that are tracked or regulated by EPA or other sources. It is the authoritative resource for basic information about chemicals, biological organisms, and other substances of interest to EPA and its state and tribal partners.

大宗化学品在美国排放情况排名Scorecard(免费)

Scorecard provides detailed information on more than 11,200 chemicals, including all the chemicals used in large amounts in the United States and all the chemicals regulated under major environmental laws. You can search for information by typing in the chemicals name (or any common synonym) or the chemicals standard identification number (Chemical Abstracts Service or CAS registry number).

Distributed Structure-Searchable Toxicity (DSSTox) Public Database Network
The Distributed Structure-Searchable Toxicity (DSSTox) Database Network provides a community forum for publishing standard format, structure-annotated chemical toxicity data files for open public access.