Significant

Section 204.660  Significant a)         "Significant" means, in reference to a net emissions increase or the potential of a source to emit any of the following pollutants, a rate of emissions that would equal or exceed any of the following rates: Pollutant and Emissions Rate Carbon monoxide 100 tpy NO X 40 tpy SO 2 40 tpy PM 25 tpy of particulate matter emissions PM 10 15 tpy PM 2.5 10 tpy of direct PM 2.5 emissions; 40 tpy of SO 2 emissions; 40 tpy of NO X emissions unless demonstrated not to be a PM 2.5 precursor under Section 204.610(a)(2)(C) Ozone 40 tpy of VOM or NO X Lead 0.6 tpy Fluorides 3 tpy Sulfuric acid mist 7 tpy Hydrogen sulfide (H 2 S) 10 tpy Total reduced sulfur (including H 2 S) 10 tpy Reduced sulfur compounds (including H 2 S) 10 tpy GHGs 75,000 tpy CO 2 e Municipal waste combustor organics (measured as total tetra-through octa-chlorinated dibenzo- p -dioxins and dibenzofurans) 3.2 ×10 -6 megagrams per year (3.5 ×10 -6 tpy) Municipal waste combustor metals (measured as PM) 14 megagrams per year (15 tpy) Municipal waste combustor acid gases (measured as SO 2 and hydrogen chloride) 36 megagrams per year (40 tpy) Municipal solid waste landfills emissions (measured as nonmethane organic compounds) 45 megagrams per year (50 tpy) Ozone depleting substances 100 tpy b)         "Significant" means, in reference to a net emissions increase or the potential of a source to emit a regulated NSR pollutant that subsection (a) does not list, any emissions rate. c)         Notwithstanding subsection (a), "significant" means any emissions rate or any net emissions increase associated with a major stationary source or major modification that would construct within 10 kilometers of a Class I area, and have an impact on that area equal to or greater than 1 μg/m 3 (24-hr average).