To improve energy efficiency, many homes are now made to reduce and control the amount of fresh air that is circulated from outside.
However, I'm told that many cushions used in couches and materials used in flooring such as carpeting emits dangerous gases over time and that in a home that is tightly sealed, these gases can reach unsafe levels.
Therefore, when shopping for furniture or flooring materials such as carpeting, how can I know the level of these issues in products I am considering?