The request was initially declined, because of heavy air traffic in the area; by the time it was granted, the aircraft had vanished from radar.

It came after the area was pounded by heavy air strikes.

In order to collapse tunnels too deep for the demolition teams to find and crush, the village was then subjected to heavy air bombardment.

For example, coal power plants are built away from cities to prevent their heavy air pollution from affecting the populace.

During winter the process reverses and cold, dry heavy air flows outward from the continents, producing a dry season.