Crit’Air is a system designed to prevent the most polluting vehicles entering certain urban areas within France, and to reduce the amount of freedom within these zones of more polluting vehicles. It’s ...

The critical system is separate from air traffic control, which keeps planes a safe distance from each other. Duffy did not say when officials expected the system to be up and running again.

The Critical Zone is the thin layer of Earth's surface where rock, soil, water, air, and living organisms interact, playing a vital role in processes such as water filtration, nutrient cycling and ...