White Sage is mostly used as a cleansing herb, to purify the mind, body and spirit of negativity, to cleansing a new home,clearing spaces of unwanted entities and much more... Smudging with white sage can help to bring in positive energy after moving unwanted energies. It has a relaxing and calming effect on both, people and spirits.
Rosemary brings mental clarity and calmness, releases healing and clearing energies. It is great for meditation. Its scent helps to uplift your body and spirit, clearing and healing the inner self.
Smudges may help clear the air, scientists have observed that sage can clear up to 94 percent of airborne bacteria and disinfect the air. Also, when sage is burned, it releases negative ions, which is linked to putting people into a positive mood. 
Smudging requires simple ingredients like matches, smudging herbs, and a smudging bowl. Before you start, remember to open a door or window, because the unwanted energy you are trying to clear must have a pathway to get out. First, light one end of your smudge, allowing it to catch fire and burn for several seconds. Then gently blow on the lit end - the smudge will begin to glow and smoke. Lay the smudge on a heatproof bowl to catch the ashes as it burns.