Editing Dust aerosol concentration (section)

== Monitoring and Measurement ==
Monitoring dust aerosol concentration involves a combination of ground-based, airborne, and satellite observations. Ground networks such as the U.S. [https://en.wikipedia.org/wiki/United_States_Environmental_Protection_Agency Environmental Protection Agency]'s Clean Air Status and Trends Network (CASTNET) provide measurements of particulate matter and aerosol properties. Airborne campaigns like [https://en.wikipedia.org/wiki/NASA NASA]'s Atmospheric Tomography (ATom) mission collect in situ aerosol microphysical data across global flight tracks.

Remote sensing instruments measure aerosol optical depth (AOD), which relates to dust loading in the atmosphere, using satellites and unmanned aerial systems. Optical-based techniques enable real-time quantification of mineral dust concentrations in coarse particulate matter fractions (PM10–2.5). Particle size distribution analyses during dust events help characterize the physical and chemical properties of dust aerosols. These diverse methods collectively inform assessments of dust aerosol concentration and its variability.

Within the SIGNAL system, dust aerosol concentration is treated as a defined environmental signal whose boundaries and measurement conventions are described below.