This true-color image shows a large plume of Saharan Desert dust (light brown) blowing westward off the coast of Morocco and arcing sharply back toward the northeast and the Canary Islands in the eastern Atlantic. This scene was acquired on July 25, 2004, by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard NASA’s Aqua satellite.
The large copy of the image available here is at 500 meters per pixel.
NASA image by Jesse Allen, Earth Observatory, using data courtesy MODIS Land Rapid Response System