No, I believe it doesn't show up in your hair. Unless you are in a tight, enclosed space -- it wont get too much into your system, to the point where you get a little ditzy. But, the most it will do to your hair is make it smell like weed. You can simply wash it out ; and your good.
Well for one thing what would you consider being around it? Are you sitting next to someone smoking weed? In that case yes it will get into you're system and you get you're hair tested it will show up.
If you don't smoke weed and around it will it be in your urine
If you are around it, even if you don't smoke it, it does get into your system because you are inhaling it. It does show up on hair.
If your in a closed room with no windows. It can get in your system.