Indian people perform stretch exercises on a foggy morning in Allahabad, India, Tuesday, Dec. 13, 2011. Dense fog continued to play havoc with flight and train schedules leading to cancellations, ... more 
Indian people perform stretch exercises on a foggy morning in Allahabad, India, Tuesday, Dec. 13, 2011. Dense fog continued to play havoc with flight and train schedules leading to cancellations, delays and diversions, according to news reports. (AP Photo/Rajesh Kumar Singh) less 
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Associated Press | Photo By Rajesh Kumar Singh
Tue, Dec 13, 2011 3:57 AM EST