The NOAA Geophysical Monitoring for Climatic Change Stations
(GMCC) measure and observe atmospheric aerosols. The goals of
this regional-scale monitoring program are to characterize
means,
... variability, and trends of climate-forcing properties of
different types of aerosols, and to understand the factors that
control these properties.
Additional information available at
http://www.cmdl.noaa.gov/aero/
[Summary provided by NOAA]