CLEAN THE AIR WE SHARE - Indoor Air Matters. We spend 90% of our time indoors and nine hours every day sharing spaces with others. While we don't usually give much thought to indoor air quality, we should. The air we breathe indoors is up to five times more polluted than outdoor air. Public spaces, like offices, health care facilities and schools are breeding grounds for bacteria, viruses, dust and allergens, and harsh chemicals and odors.