Air Quality and Emissions Data; Supporting Information for the Residential Wood Heater New Source Performance Standard 
This spreadsheet includes recent fine particulate matter (PM2.5) emissions from residential wood smoke combustion (RWC) and PM2.5 air quality design values (DVs) by state and county.  
The emissions data are expressed in terms of tons per year (tpy) and are taken from EPA's preliminary 2011 National Emissions Inventory (NEI).   The NEI contains emissions data submitted by the states and augmented by EPA if no state data are available.  This inventory is expected to be finalized in September.  Currently, the NEI includes emissions data for point sources, nonpoint (or area) sources, and nonroad mobile sources.  Onroad mobile source emissions were not available for this analysis.  We believe that the impact of not including onroad mobile source emissions in the total PM2.5 emissions is relatively small given that onroad mobile sources contributed only 6% to the total PM2.5 emissions in the 2008 NEI.  Also, wildland fire emissions were not included in the total PM2.5 emissions here because the impact of these emissions can be excluded under our exceptional events rule in determining an area's attainment status.   Also please note that although this is the most up to date inventory available for RWC, we are continuing to improve our emissions inventories.  For example, we believe that the relative PM2.5 RWC contributions are overestimated in some areas and underestimated in others.
The DVs shown here are based on the 3-year period 2009-2011 and are computed using Federal Reference Method or equivalent data reported by states, tribes, and local agencies to EPA's Air Quality System as of July 26, 2012.  
 Counties with annual DVs between 10 micrograms/cubic meter (ug/m3) and 11.9 ug/m3 are highlighted in yellow in column 6.  This range of values was chosen to include areas that are roughly within 10% of the annual national ambient air quality standard (NAAQS).
 Counties with annual DVs equal to or greater than the annual NAAQS are highlighted in red.  
 Counties with 24-hour DV's between 30 ug/m3 and 34.9 ug/m3 are highlighted in yellow in column 7.  This range of values was chosen to include areas that are roughly within 10% of the 24-hour NAAQS.
 Counties with 24-hour DVs equal to or greater than the 24-hour NAAQS are highlighted in red.   
Sheet 1 in the spreadsheet contains counties with a % RWC contribution > 10% in column 5, annual DV >= 10 ug/m3 in column 6, or 24-hour DV >= 30 ug/m3 in column 7.  Sheet 1 is sorted on column 5 from highest to lowest.  
Sheet 2 contains counties with a % RWC contribution > 10% in column 5, but have no monitoring data and, therefore, no DVs. 
