If you are worried about it.......Carry Tourmaline crystal...........Tourmaline has a charge, that attracts negative ions. It's used in reef aquariums and waste treatment, because it emits a positive charge. That attracts negative IONS, in an aquarium it work similar to "Ozone" which cleans the water columns of decomposed organics.

BUT....the science shows, the crystal works...."Metaphysically" the way it does in the reef. It cleans the energy field around you,