Meaning of PPB | Babel Free

Definitions

1. Initialism of parts per billion.
   abbreviation, alt-of, initialism, plural, plural-only
2. Initialism of production-possibility boundary.
   abbreviation, alt-of, initialism

Examples

“The International Organization for Standardization (ISO)² does not accept the common use of parts per billion (ppb) for two reasons: the meaning of billion is ambiguous, and parts is also ambiguous because it could refer to volume, mass, number, or some other measure.”

“. Therefore, Great River Energy expects ozone and NO concentrations associated with the Project to be negligible, and well below all federal standards (nitrogen dioxide (NO2) – 100 parts per billion (ppb) as one-hour average, 53 ppb as annual average; ozone 70 ppb as 8-hour average).”

CEFR level