NLCD 2006

Nexrad base reflectivity

Reference Emisions

Ammonia - 4km

Carbon Monoxide - 4km

Isoprene - 1km

Monoterprene - 1km

Sesquiterprene - 1km

The emissions are from the U.S. EPA BEIS 3.14 inventory, and the 1-km resolution BELD-3 landuse database. The emissions in the plots are for a standard temperature (30 degrees C) and radiation (1000 PAR). These are "summertime" emissions - applicable to full foilage.

The basis for the BEIS/BELD3 emissions can be found in Pierce et al. (1998). Updates to revised versions of BEIS can be found in: BEIS version 3.09: J. Vukovich and T. Pierce, Implementation of BEIS3 within the SMOKE Modeling Framework, presented at the Emissions Inventory Conference, Environmental Protection Agency, Atlanta, Georgia, 2002, available at conference/ei11/index.html#ses-10. BEIS version 3.12: (Go to for EPA official description of version 3.12) T. Pierce et al., Integration of the Biogenic Emission Inventory System (BEIS3) into the Community Multiscale Air Quality Modeling System, paper presented at 12th Joint Conference on the Applications of Air Pollution Meteorology with the A&WMA, American Meteorological Society, Norfolk, Virginia, 2002). BEIS version 3.14: Schwede, D., G. Pouliot, and T. Pierce (2005), Changes to the biogenic emissions inventory system version 3 (BEIS3), paper presented at 4th Annual CMAS Model-3 User's Conference, Chapel Hill, N. C., 26–28 Sept. Available online: Pierce, T., C. Geron, L. Bender, R. Dennis, G. Tonneson, and A. Guenther (1998), Influence of increased isoprene emissions on regional ozone modeling, J. Geophys. Res., 103, 25,611–25,629, doi:10.1029/98JD01804.

For more information, contact Stu McKeen (, 303-497-5622).

Map point emissions source were created by converting excel file documented below to kml.

The file is a download from the US EPA Air Markets Program Data site ( on January 22, 2013. The data are for the 3rd calendar quarter (July - September) of 2012. Data for individual reporting emission units (boilers+stacks) are aggregated to the level of a single power plant. All continental US power plants and a few other US point sources covered under the US EPA's various point source control programs (e.g., the Acid Rain Program, the SIP NOx Program, the Clean Air Interstate Rule, etc) are included in this file. This data set is also known as the Continuous Emissions Monitoring Systems (CEMS) data.

The data are organized by US state (2-letter US Post Office abbreviation). In addition to the facility's name, the point source's US DOE identification number (ORISPL) and centroid latitude and longitude (degrees, N/E = positive) are included. Emissions totals from each facility for the 3rd calendar quarter of 2012 are reported for sulfur dioxide (SO2), nitrogen oxides (NOx = NO+NO2), and carbon dioxide (CO2) in short tons per calendar quarter (1 short ton = 907.185 kg). To convert SO2, NOx, and CO2 mass emissions to molar units, the following molecular weights are typically used: SO2 = 64.1 g/mol, NOx = 46.0 g/mol, CO2 = 44.0 g/mol. Also reported for each facility are two measures of the facility's total production for the 3rd calendar quarter of 2012: heat input applied to the boilers in millions of British thermal units (MMBtu), and gross load (i.e., electrical power generated) in megawatt-hours (MW-h).

For more information about the individual generation units (including details about the fuel used and control strategies employed), as well as the origin of the CEMS data set, please see the AMPD site ( For questions about the data file, contact Greg Frost (, 303-497-7539).