After typing in your keywords, then add site:.gov to your search. Then, you will find federal, state and local sources. Check out the examples below:
Database of toxic substances. The Agency for Toxic Substances and Disease Registry (ATSDR), based in Atlanta, Georgia, is a federal public health agency of the U.S. Department of Health and Human Services. ATSDR serves the public by using the best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and diseases related to toxic substances.
Government agency that provides information on health topics, statistics and other publications related to public health and disease.
NIOSH is a federal government agency within the CDC tasked with protecting workers. The site includes information on Emergency Responders, Emergency Response Health Monitoring and Surveillance (ERHMS), Fire Fighters Resources Directory,Terrorism Response and more.
Information on how to prepare for a variety of emergency situations such as natural disasters and terrorist attacks.