ALT The visualization depicts a computer model output for aerosols on August 23, 2018. On that day, huge plumes of smoke drifted over North America and Africa, three different tropical cyclones churned in the Pacific Ocean, and large clouds of dust blew over deserts in Africa and Asia. The storms are visible within giant swirls of sea salt aerosol, shown in blue, which winds loft into the air as part of sea spray. Black carbon particles, shown in red are among the particles emitted by fires; vehicle and factory emissions are another common source. Particles the model classified as dust are shown in purple. The visualization includes a layer of night light data, with glowing white lights indicating the locations of towns and cities.