While there’s a need to be concerned with the quality of outdoor air in heavily populated areas, the air you breathe inside can also be riddled with problems. The air inside a building, when re-circulated, can be five times more polluted! The pollution indoors comes from Volatile Organic Compounds, and can be made up of everything from rotting plant life to carpets, furniture foam, and cleaning products. Also, if your A/C’s filtration system isn’t working properly: bacteria. You’d think that new buildings would be best, but they can have some of the worst air, as all the fumes from the new materials could be doing you harm. So what should you do? Open a window, or go outside!