Hi @cameronsmith1 : I'm asking whether we accept them as defined in `udunits2`. 
In `udunits2`, `ppm` and `ppmv` are exactly equivalent and interchangeable. My 
opinion is closer to yours: these two units are similar, but not equivalent. 
Hence, it might be worth excluding `ppmv` and other "by-volume" units in the 
grounds that the "by-volume" information is really information about the 
variable which should be in the standard name.

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