There are several indoor air pollutants that most people don't even know about that can be harming your health.
Indoors has more air pollution than outdoors so it's a good idea to get outside as much as possible to breathe in some fresher air and ventilate your home.
The Top 4 Indoor Air Pollutants are.
1: Carbon Monoxide.
2: Nitrogen Dioxide.
3: Radon.
4: Mold.
A few other indoor air pollutants are second hand smoke, lead particles and asbestos.