August 2009, eh? On August 24, 2006, Pluto was
about 30.76 AU away from Earth, or about 92.956×10^6 miles or about 149.598×10^6 kilometers. From Aug. 24, 2006 to Aug. 3, 2009, there are 365+1-(24-3) or 345 days. To reach Earth by Aug. 3, 2009, the fragments would have to be travelling at 11,226 mph or 18,067 kph. Discounting whatever effect the atmosphere would have on the fragments (or vice versa), I don't think staying indoors would help you much.
[rereads] Ohhhh, wait, now I get it. Never mind.