Best way to clear negativity from office?

Our department has had a number of bad things happen this month: Someone was hit by a car, someone had a miscarriage, one employee's mother fell down the stairs and was seriously hurt, another employee's father just died, another's is dying. There are only 25 of us, so that is beyond statisitics.

I want to do some sort of clearing and protection, but not an obvious one, like smudging, since that will bring on the fire brigade after the smoke detectors go off! What can I do surreptitiously?

Change office or open own one