...国家人口密度列表 List of sovereign states and dependent territories by population density ; Inhabitants per km ; List of countries by population density ; List of population density 人口密度梯度 pophulaion density gradient 限制人口密度 limit densities ..
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At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.
污染最轻的是美国和加拿大的城市，原因是它们的人口密度低，气候怡人，并且空气污染管理规定非常严格。
At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.
在污染排行中最靠后的是加拿大和美国的城市，受益于较低的人口密度、优越的气候和较严格的空气污染法规。
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