<p>Press Forge operates a facility which manufactures forged parts for various industries. Press Forge produces alloys of iron, stainless steel, aluminum, titanium, nickel, cobalt, copper, and lead. Products are manufactured using drop forging, open dye forging, closed dye forging, and other forging techniques. The equipment at the facility includes thirteen forging furnaces fueled by natural gas. The project includes preparation of their Annual Emissions Inventory Report required by the South Coast Air Quality Management District (SCAQMD) on an annual basis and&nbsp;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,&nbsp;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.</p>