As far as I know environmental fields are fine to loop. I loop Plasma Flower Node 24/7 and I have done it with Feng Shui Master of the Shire.
Here’s what Maoshan said in another thread:
I use them as a Radio stack which I turn on when I leave home and it keeps playing this stack in a loop. I turn it off when I am back home from work (sometimes I keep it on all the time even when I am at home, at a very low volume). Environmental Fields Thread