It is also equivalent to one part per billion (ppb). One ppb is 1,000 times a part per million. Concentrations measured in ppm and ppb are so small that they can be difficult to conceptualize.

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The 12-month average of 419.3 ppm is about 50% higher than estimated ... reaching an average of 1,922.6 parts per billion, up 10.9 ppb from 2022 but lower than a record increase of 15.2 ppb ...

The M500 TOC analyzer enables simultaneous measurements of conductivity and has an operating range of 0.03 ppb to 2.5 ppm with excellent accuracy. The new model increases analysis speed by as much as ...