Air quality in America’s largest cities has steadily improved thanks to tighter regulations on key sources of particulate pollution. However, increased heat, wildfire smoke and other emerging global ...

If you’ve noticed more London accents on the L train lately, it’s not your imagination: New York has officially claimed the ...

A Newsweek map shows the world’s 100 largest cities by population, according to updated United Nations data—including the only two U.S. metropolises to make the cut: New York and Los Angeles. The ...

UN rankings updated using new criteria to better reflect the mass urban transformation driving a global shift in how we live—and the megacities emerging from it. A new United Nations report has ...