Emissions unit means any part or activity of a stationary source that emits or has the potential to emit any regulated air pollutant or any pollutant listed under Section 7412(b) of the FCAA. This term is not meant to alter or affect the definition of the term "unit" for purposes of Title IV of the FCAA.
Oxides of nitrogen means the sum of the volume mixing ratio (ppbv) of nitrogen monoxide (nitric oxide) and nitrogen dioxide expressed in units of mass concentration of nitrogen dioxide (μg/m3);
Acid rain emissions limitation means, as defined in 40 CFR 72.2*, a limitation on emissions of sulfur dioxide or nitrogen oxides under the acid rain program under Title IV of the Clean Air Act (CAA).
PM10 emissions means PM10 emitted to the ambient air as measured by an applicable reference method, or an equivalent or alternate method, specified in 40 CFR Part 51, Appendix M as of December 8, 1984, or by a test method specified in these regulations or any supplement thereto.
greenhouse gas emissions means emissions in terms of tonnes of CO2 equivalent of carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), nitrogen trifluoride (NF3) and sulphur hexafluoride (SF6) determined pursuant to Regulation (EU) No 525/2013 and falling within the scope of this Regulation;