If you want to cause mass evacuation of employees so everyone pisses off to the park, or show the fuckers how much you care, then go ahead! They'll luv it. And say "Next week: testing new chemical weapons!" and laugh loudly because one's own jokes are the funniest.
No, seriously, please don't. :) Even if you can open the windows (most offices these days are sealed, with all the inmates and their germs) it will prob. take a week to air.