Hazardous Materials Identification System. The Hazardous Materials Identification System (HMIS) is a numerical hazard rating that incorporates the use of labels with color developed by the American Coatings Association as a compliance aid for the OSHA Hazard Communication Standard. 1 HMIS Color Bar.
Definition of greenhouse gas. : any of various gaseous compounds (such as carbon dioxide) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect.
Greenhouse gases are gases in the Earthâs atmosphere that can absorb and emit radiation. This particular process is the main cause of the greenhouse effect that is currently a threat to our planet. Main greenhouse gases are composed of water vapor, methane, carbon dioxide, nitrous oxide and Ozone.