These 18 US cities are among the happiest in the world, new report says
Even as the U.S. slips in the global happiness rankings, 18 of its cities landed among the latest "Happy City Index." ...
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Top 10 World's Largest Cities by Population, Tokyo Leads the Pack
Some of the largest cities in the world are known for experiencing skyrocketing population growth that shows no signs of ...
India has six of the world's 10 most polluted cities, report shows
Chad, in central Africa, is the world’s most polluted country, while California has the worst air pollution in North America, ...