Two factors had an overwhelming influence on the speed of COVID's spread: population density and long-term exposure to air pollution.

"Almost one in five people on Earth experienced increases in exposure to urban heat over the past 30 years." Poor and marginalized people are most at risk.

Fewer people used urban parks during summer of 2020, a drop that more likely affected minorities and those from lower-income backgrounds.

"There's evidence of a large cosmic airburst, close to this city called Tall el-Hammam." The shock of the explosion over the city was enough to level it.

Living in urban areas is causing many mammals to grow bigger. Lots of available food in areas packed with people may explain why.

The solution to traffic jams at busy intersections in cities may be removing certain left turns, researchers say.

It's been really hot in areas of the US lately. An expert offers tips keeping cool during a heat wave and explains why they're getting harder to handle.

Every fall and spring, thousands of migrating birds are killed when they crash into illuminated windows. Turning off some lights can make a big difference.

Decades after federal bans ended widespread use of lead paint and gasoline, some urban soils still contain levels that exceed safety guidelines for kids.

Your local city park can improve your health, according to a new study. Access to nature offers a wide range physical and mental benefits, researchers say.