The world's tallest mountain is looking better by the day.

More than 100 climbers have collected 4.5 metric tons of garbage on the north slope of Qomolangma, known as Mount Everest in the West, in an annual cleanup campaign.

The volunteers, including local Tibetans, domestic and overseas mountaineers, and staff of Tibet's mountaineering work units, have been working at altitudes of between 5,200 and 6,500 meters since May 6.