Why is Indoor Air Pollution of concern to the U.S.? EPA?

Question

Why is Indoor Air Pollution of concern to the U.S.? EPA?

Answer 1

Indoor Air is terrible!  It kills people.  It contains volatile organic compounds, sawdust, lead dust, asbestos, cigarette smoke, radon, mold, fungus, bug bits, moose faerts, black powder residue, benzene, and burnt bacon smoke. That is why I bought the oreck XL air purifier and a Ronco Roaster Oven.

Answer 2

Because it's a human health problem due to chemical pollution.  Who else would be responsible for that?  More info:

http://www.epa.gov/iaq/