You may not know it, but the air in your home can be dirty and hazardous to your health. In fact, indoor air can be even more polluted than the air outdoors. We tend to think of air pollution as something outside -- smog, ozone, or haze hanging in the air, especially in summer. But the truth is, the air inside homes, offices, and other buildings can be more polluted than the air outside. Here are 11-ways to improve your homes air quality.