Tier 1 produces a qualitative occupational exposure band (OEB) assignment based on Globally Harmonized System of Classification and Labeling of Chemicals (GHS). Tier 1 involves assigning the OEB based on criteria aligned with specific GHS hazard codes and categories. Chemicals with potential to cause serious or irreversible health effects at relatively low doses warrant assigning band D or band E. Chemicals that are likely to cause reversible health effects at higher concentrations are categorized in band C. Bands A and B are not assigned in Tier 1. Tier 1 is intended to be used by individuals with basic toxicology knowledge.

Please note that the following hazard codes will not be used for Tier 1 Banding: H200’s (physical hazards), H303, H305, H313, H316, H320, H333, H335, H336, H362, and H400’s (environmental hazards). If a chemical has been assigned any of these codes, they will not contribute to the Tier 1 band assignment.

Tier 1 Criteria      Tier 1 Examples      Tier 1 Resources

Basic instructions to use the Occupational Exposure Banding e-Tool for Tier 1. Illustration of Tier One

Page last reviewed: September 21, 2021
Page last updated: September 21, 2021
Content source: National Institute for Occupational Safety and Health  Division of Science Integration