MOVAS stands for the MODIS (MOderate-resolution Imaging Spectroradiometer) Online Visualization and Analysis System. MOVAS was created by the technical staff of the Goddard Earth Sciences Data and Information Services Center (GES DISC), and is part of the GES DISC Online Visualization ANd aNalysis Infrastructure "Giovanni". MOVAS is a web-based tool designed for visualization and analysis of the Terra / MODIS Atmosphere Level-3 Monthly Product (MOD08_M3). This product has global coverage with 1° degree spatial resolution mapped on an equal angle lat-lon grid. Seventeen (17) high-interest parameters were chosen (out of nearly 80 available) to be included in this online analysis system. Users can plot area average (area plot) and time series (time plot) or generate ASCII output for selected area and time period. Users can also make comparisons of two parameters.