A girl stands at the entrance of her house in a slum on the outskirts of Islamabad January 8, 2013. — Reuters Photo

Girls attend class at a school in a slum on the outskirts of Islamabad January 8, 2013. — Reuters Photo

An elderly Pakistani man, searches for items in a garbage dump hoping to sell to a recycling factory, on a cold, foggy day, on the outskirts of Islamabad, Pakistan, Monday, January 7, 2013. — AP Photo

A Pakistani resident walks with his dog during a cold and foggy morning in Islamabad on January 8, 2013. Ongoing foggy weather in Punjab and other parts of the country has badly affected flight and rail schedules. — AFP Photo

A Pakistani resident covers his body with a warm shawl as he walks along a street during a cold and foggy morning in Islamabad on January 8, 2013. Ongoing foggy weather in Punjab and other parts of the country has badly affected flight and rail schedules. — AFP Photo

A Pakistani oil seller walks along street on a cold and foggy day at a slum area of Peshawar on January 7, 2013. Several major cities of Pakistan have been engulfed by thick fog causing traffic problems and flight cancellations. — AFP Photo

A girl cries while she stands behind a torn makeshift curtain at the entrance of her house in a slum on the outskirts of Islamabad January 8, 2013. — Reuters Photo

A girl smiles as she carries her brother in a slum on the outskirts of Islamabad January 8, 2013. — Reuters Photo

A Pakistani homeless family stands outside their tent on a cold and foggy day at a slum area of Peshawar on January 7, 2013. Several major cities of Pakistan have been engulfed by thick fog causing traffic problems and flight cancellations. — AFP Photo