Please, I would like to know the typical concentrations (mol fraction, volume fraction, not the units in mass/volume) to decide gas mixture concentrations that should be available of the folllowing:

- methane in enteric fermentation? obvioulsly it could depends on feed diet and type of livestock, I guess milk cows produce more methane at emission levels. Is that due to the concentration or has to do with the amount they produce?

- methane for rice fields?

-Fugitive emission (leaks) in natural gas transport, distribution and storage. I found they are in the ppm range.

Thank you for your help!

Regards

Jorge

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