NASAVertical profiles of aerosol and cloud distributions from NASA's CALIPSO satellite, enabling 3D mapping of smoke, dust, and pollution layers at global scale since 2006.
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MAIAC AOD: Multi-Angle Atmospheric Correction
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The Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm retrieves aerosol optical depth and surface reflectance from MODIS at 1-kilometer resolution globally. Unlike traditional dark-target approaches, MAIAC uses time-series analysis and angular information to separate surface and atmospheric contributions.
MAIAC AOD is widely used for satellite-based PM2.5 estimation in epidemiological studies, particularly in urban areas where coarser-resolution products are insufficient. The algorithm runs on the complete MODIS record from 2000 to present and is available through NASA's Earthdata LAADS DAAC.
Learn more
Documentation, algorithm details, and background reading for MAIAC.
Download data
Access MAIAC through the provider portal or download it directly.
Tutorials
Self-paced tutorials to help you get started with MAIAC.
Getting started with MAIAC
An introduction to the MAIAC dataset — what it measures, how it is produced, and when to use it.
Accessing and downloading MAIAC dataFind, subset, and download MAIAC data, with tips for common file formats and access tools.
Exploring MAIAC in the AIR4US visualization toolLoad MAIAC layers in the AIR4US visualization tool and interpret them alongside other air quality data.
Cite this dataset
NASA GSFC. MAIAC AOD: Multi-Angle Atmospheric Correction. 2000 – Present. Accessed via the AIR4US Portal, https://earthdata.nasa.gov.
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