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Earth Observatory Aerosol Optical Depth

Published by National Aeronautics and Space Administration | National Aeronautics and Space Administration | Metadata Last Checked: October 30, 2025 | Last Modified: 2025-03-31
Tiny solid and liquid particles suspended in the atmosphere are called aerosols. Windblown dust, sea salts, volcanic ash, smoke from wildfires, and pollution from factories are all examples of aerosols. Depending upon their size, type, and location, aerosols can either cool the surface, or warm it. They can help clouds to form, or they can inhibit cloud formation. And if inhaled, some aerosols can be harmful to people’s health.

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