A US Federal Court ruling and the EPA have struck down the 2005 Clean Air Interstate Rule, a cornerstone of the Bush Administration's plan to control air pollution. Michelle Miller reports.

- without any other objects - such as an air purifer - and with only windows

I have an air purifier that covers a 12' by 4' room.   I recently moved and new room is bigger.    could I buy the same model and put the two in the same room and would they cover the bigger room together?

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