Lidar shows air at its most empty



In the past few weeks, National Oceanic and Atmospheric Administration atmospheric scientists have used lidar instruments trained on some of the cleanest air on Earth to measure what may be the global background concentration of aerosols in the atmosphere.

The observations are part of an effort to determine if air at its most clear still contains sufficient numbers of aerosol particles to allow a planned satellite-based lidar to use them to track upper atmospheric winds all over the world.