What does pp2b mean?
Pp2b means Initialism of parts per billion..
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Pronunciation varies by accent · noun
Initialism of parts per billion..
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).
Use pp2b when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Pp2b means Initialism of parts per billion..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
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.
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