Everyone knows bad air quality when they breathe it in, but how does it measure and compare across different capital cities? To get this information, the amount of particulate matter is measured to ...

Many of the wealthiest people in the world are concentrated in just a handful of cities -- several of which are in the U.S.

The airport will feature five parallel runways, 400 aircraft gates, and state-of-the-art technology to handle up to 260 million passengers per year.