Pollution in your home is often 2 to 5 times higher than it is outdoors, according to the EPA.
Some quick tips:
1. Be careful of chemical laden candles or air freshners.
2. Open your windows to air out your home when the weather permits.
3. Try and use Eco-friendly cleansers whenever possible or if you must use conventional cleansers use a surgical or filtered mask and vent your home.
Additional Source: http://www.prevention.com/