anchor: The REMSAD modeling domain selected for the Clear Skies Act consists of 36 km x 36 km grid cells covering the 48-contiguous United States, and REMSAD can perform a full-year simulation, generating predictions of hourly PM concentrations (including both PM2.
positive: The modelling domain consists of  36 km x 36 km grid cells.
negative: The grid cells cover the 269-contiguous United States