cat /proc/<pid>/environ
If you want to have pid(s) of a given running executable you can, among a number of other possibilities, use pidof:
AlberT$ pidof sshd
30690 6512
EDIT:
I totally quote Dennis Williamson and Teddy comments to achieve a more readable output.
My solution is the following:
tr '\0' '\n' < /proc/<pid>/environ
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