The Comparative Toxicogenomics Database (CTD) identifies interactions between chemicals and genes/proteins in diverse organisms to elucidate the molecular mechanisms by which environmental chemicals affect human health.
CTD curates chemical-gene/protein interactions from the published literature and integrates diverse data (chemicals, genes/proteins, references, sequences, vertebrate and invertebrate organisms, and Gene Ontology) to facilitate unique cross-species and functional perspectives on toxicogenomic information
http://ctd.mdibl.org/

Developmental and Reproductive Toxicology - Current and older literature on developmental and reproductive toxicology.
https://toxnet.nlm.nih.gov/newtoxnet/dart.htm

EMIC is prepared by the Environmental Mutagen Information Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee (EMIC/ORNL) for the federal government. EMIC covers environmental mutation literature from 1950. The records contain CAS Registry Numbers.
http://toxnet.nlm.nih.gov/help/emichelp2.html#SearchScreen

EPA provides on this site Informations about Methods, Models, Tools, and Databases about the following fields: > AIR > CLIMATE CHANGE > ECOSYSTEMS > HEALTH > HOMELAND SECURITY > LAND AND WASTE MANAGEMENT > SAFER CHEMICALS > WATER
http://www2.epa.gov/research/methods-models-tools-and-databases

The Global Disaster Alert and Coordination System provides near real-time alerts about natural disasters around the world and tools to facilitate response coordination, including media monitoring, map catalogues and Virtual On-Site Operations Coordination Centre
http://www.gdacs.org/

The HEI Air Quality Database, prepared and maintained by Atmospheric and Environmental Research (AER) Inc, focuses on levels of PM2.5 components and gaseous pollutants at and near sites in the EPA's PM2.5 Chemical Speciation Trends Network (STN) and State, Local and Tribal air monitoring stations (SLAMS).
http://hei.aer.com

A product of the Cincinnati based Toxicology Excellence for Risk Assessment, ITER presents chemical risk information from authoritative groups worldwide, including the U.S. Environmental Protection Agency, the U.S. Agency for Toxic Substances and Disease Registry, Health Canada, the Dutch National Institute of Public Health and the Environment, the International Agency for Research on Cancer, as well as independent parties whose risk values have undergone peer review.
https://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?iter.htm

TRI contains data on the estimated annual releases of toxic chemicals to the environment – air, water, soil, underground injection; amounts transferred off-site for waste treatment; and source reduction and recycling data.
This is a NLM-database.
https://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?TRI