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40 CFR §1037.805

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The procedures in this part generally follow either the International System of Units (SI) or the United States customary units, as detailed in NIST Special Publication 811 (incorporated by reference, see § 1037.810). See 40 CFR 1065.20 for specific provisions related to these conventions. This section summarizes the way we use symbols, units of measure, and other abbreviations.
  1. (a)Symbols for chemical species. This part uses the following symbols for chemical species and exhaust constituents:
  2. (b)Symbols for quantities. This part 1037 uses the following symbols and units of measure for various quantities:
  3. (c)Superscripts. This part uses the following superscripts for modifying quantity symbols:
  4. (d)Subscripts. This part uses the following subscripts for modifying quantity symbols:
  5. (e)Other acronyms and abbreviations. This part uses the following additional abbreviations and acronyms:
  6. (f)Constants. This part uses the following constants:
  7. (g)Prefixes. This part uses the following prefixes to define a quantity: