Carbon dioxide emissions for the Phoenix-Tucson corridor look as large as those for other major urban areas across the U.S. The NASA-DOE funded Vulcan Project at Purdue University calculated CO2 from industry, power generation, ground transportation, commercial, and residential sources for 2002.
The units are log base 10 of metric tonnes of carbon/gridcell/year. The data are plotted for 10x10 km grids.