An essential part of doing breathwork, is clearing the energy of the space that you are breathing in. When negative emotions and trauma are coming up and getting released the energy needs to be cleared from the space. These energies can feel heavy, thick and even have a strong charge that can be felt.
Start working in a clear space and be sure to cleanse the space after each breathwork session. Sage is good for heavy duty cleansing and Paolo Santo is another very effective energy and space clearer, with a lighter energy.
Native Spirit also uses and recommends Pure Heart Alchemy Sprays. These can be purchased from pureheartalchemy.com