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The Mississippi River Basin (MRB) in the Community Multiscale Air Quality (CMAQ) conterminous United States (CONUS) 12-km domain. MRB comprises six two-digit hydrologic unit code subbasins. Two U.S. Geological Survey (USGS) monitoring stations used in evaluation from the Lower MRB near the outlet (red star) to the Gulf of Mexico are displayed as red dots.
