Whitehorse () is the capital of Yukon, and the largest city in Northern Canada. It was incorporated in 1950 and is located at kilometre 1426 (Historic Mile 918) on the Alaska Highway in southern Yukon. Whitehorse's downtown and Riverdale areas occupy both shores of the Yukon River, which rises in British Columbia and meets the Bering Sea in Alaska. The city was named after the White Horse Rapids for their resemblance to the mane of a white horse, near Miles Canyon, before the river was dammed. Because of the city's location in the Whitehorse valley and relative proximity to the Pacific Ocean, the climate is milder than comparable northern communities such as Yellowknife. At this latitude, winter days are short and summer days have up to about 19 hours of daylight. Whitehorse, as reported by Guinness World Records, is the city with the least air pollution in the world. As of the 2021 Canadian census, the population was 28,201 within city boundaries and 31,913 in the census agglomeration. These figures represent approximately 70 and 79 percent, respectively, of the entire population of Yukon. History Archeological research south of the downtown area, at a location known as Canyon City, has revealed evidence of use by First Nations for several thousand years. The surrounding area had seasonal fish camps and Frederick Schwatka, in 1883, observed the presence of a portage trail used to bypass Miles Canyon. Before the Gold Rush, several different tribes passed through the area seasonally and their territories overlapped. The discovery of gold in the Klondike in August 1896, by Skookum Jim, Tagish Charlie, and George Washington Carmack, set off a major change in the historical patterns of the region. Early prospectors used the Chilkoot Pass, but by July 1897, crowds of neophyte stampeders had arrived via steamship and were camping at "White Horse". By June 1898, there was a bottleneck of stampeders at Canyon City, many boats had been lost to the rapids as well as five people. Samuel Steele of the North-West Mounted Police said: "why more casualties have not occurred is a mystery to me." On their way to find gold, stampeders also found copper in the "copper belt" in the hills west of Whitehorse. The first copper claims were staked by Jack McIntyre on July 6, 1898, and Sam McGee on July 16, 1899. Two tram lines were built, one stretch on the east bank