The NASA Aerosol Robotic Network (AERONET) program is a federation of ground-based remote-sensing aerosol networks that provide a long-term, continuous, and publicly accessible database of aerosol optical, microphysical and radiative properties for aerosol research and characterization, validation of satellite data and measurements, and valuable linkages with other databases.

AERONET collaboration provides globally distributed observations of spectral aerosol optical depth (AOD), inversion products, and precipitable water in diverse aerosol regimes. Aerosol optical depth data are computed for three data quality levels: Level 1.0 (unscreened), Level 1.5 (cloud-screened), and Level 2.0 (cloud-screened and quality-assured). Inversions, precipitable water, and other AOD-dependent products are derived from these levels and may implement additional quality checks.

The Tudor Hill Atmospheric Observatory, managed and operated by BIOS, serves as the only mid-Atlantic Ocean AERONET site, providing scientists with a variety of data, dating back to 1993, including a wealth of quality-assured data and algorithms.