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Aerosol Size & Aerosol Optical Depth

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Aerosol Size
Aerosol Size Scale
Aerosol Optical Depth
Aerosol Optical Depth Scale
Global Map Aerosol Optical Depth Image 1 Global Map Aerosol Optical Depth Image 2 Global Map Aerosol Optical Depth Image 3 Global Map Aerosol Optical Depth Image 4 Global Map Aerosol Optical Depth Image 5 Global Map Aerosol Optical Depth Image 6 Global Map Aerosol Optical Depth Image 7 Global Map Aerosol Optical Depth Image 8 Global Map Aerosol Optical Depth Image 9 Global Map Aerosol Optical Depth Image 10 Global Map Aerosol Optical Depth Image 11 Global Map Aerosol Optical Depth Image 12 Global Map Aerosol Optical Depth Image 13 Global Map Aerosol Optical Depth Image 14 Global Map Aerosol Optical Depth Image 15 Global Map Aerosol Optical Depth Image 16 Global Map Aerosol Optical Depth Image 17 Global Map Aerosol Optical Depth Image 18 Global Map Aerosol Optical Depth Image 19 Global Map Aerosol Optical Depth Image 20 Global Map Aerosol Optical Depth Image 21 Global Map Aerosol Optical Depth Image 22 Global Map Aerosol Optical Depth Image 23 Global Map Aerosol Optical Depth Image 24 Global Map Aerosol Optical Depth Image 25 Global Map Aerosol Optical Depth Image 26 Global Map Aerosol Optical Depth Image 27 Global Map Aerosol Optical Depth Image 28 Global Map Aerosol Optical Depth Image 29 Global Map Aerosol Optical Depth Image 30 Global Map Aerosol Optical Depth Image 31 Global Map Aerosol Optical Depth Image 32 Global Map Aerosol Optical Depth Image 33 Global Map Aerosol Optical Depth Image 34 Global Map Aerosol Optical Depth Image 35 Global Map Aerosol Optical Depth Image 36 Global Map Aerosol Optical Depth Image 37 Global Map Aerosol Optical Depth Image 38 Global Map Aerosol Optical Depth Image 39 Global Map Aerosol Optical Depth Image 40 Global Map Aerosol Optical Depth Image 41 Global Map Aerosol Optical Depth Image 42 Global Map Aerosol Optical Depth Image 43 Global Map Aerosol Optical Depth Image 44 Global Map Aerosol Optical Depth Image 45 Global Map Aerosol Optical Depth Image 46 Global Map Aerosol Optical Depth Image 47 Global Map Aerosol Optical Depth 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Earth’s atmosphere contains tiny liquid and solid particles called aerosols. Natural aerosol particles, such as dust and sea salt, tend to be larger than human-produced aerosols, such as particle pollution from burning fossil fuels. These aerosol size maps are based on data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. Green areas show where the aerosols that were present were mostly larger particles. Red areas show where aerosols consisted mostly of small particles. Yellow areas show plumes with an even mix of small and large particles. Gray shows where the sensor did not collect data.

The aerosol maps show average monthly aerosol amounts around the world based on observations from the MODIS sensor on NASA's Terra satellite. Satellite measurements of aerosols, called aerosol optical thickness, are based on the fact that the particles change the way the atmosphere reflects and absorbs visible and infrared light. An optical thickness of less than 0.1 (palest yellow) indicates a crystal clear sky with maximum visibility, whereas a value of 1 (reddish brown) indicates very hazy conditions.

View, download, or analyze more of these data from NASA Earth Observations (NEO):
Aerosol Size
Aerosol Optical Depth