<p>Carlton Forge Works operates a facility which manufactures mostly seamless rolled rings for the aerospace industry. Carton Forge Works produces alloys of iron, stainless steel, aluminum, titanium, nickel, cobalt, copper, and lead. Products are forged using mostly open dye forging but some closed dye forging parts are produced. The equipment at the facility includes over 60 forging furnaces fueled by natural gas. The project involved development of their Annual Emissions Inventory Report which is required by the South Coast Air Quality Management District (SCAQMD) on an annual basis and calculation of the greenhouse gas (GHG) emissions from the facility&rsquo;s stationary combustion sources to determine if California Air Resources Board&rsquo;s (CARB&rsquo;s) Mandatory Reporting of GHG Emissions Regulation is applicable to the facility. The emissions inventory includes GHGs, 5 criteria pollutants, nitrogen oxides (NOx), Volatile Organic Compounds (VOCs), carbon monoxide (CO), sulfur oxides (SOx), and particulate matter (PM), and 23 toxic airborne contaminants (TACs). The numerous furnaces at this facility create a challenge when determining the combustion emissions since some furnaces may have different criteria pollutant emission factors than others. Rigorous metering methodology is used to determine the fuel use of the many furnaces at the facility.</p>