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Cabrillo at First Mixed-Use Residential <br /> Air Quality, Global Climate Change, HRA, and Energy Impact Analysis <br /> 59 19386 <br />Sulfur Hexafluoride (SF6) <br /> <br />SF6 is an inorganic, odorless, colorless, nontoxic, nonflammable gas. SF6 has the highest global warming <br />potential of any gas evaluated; 23,900 times that of CO2. Concentrations in the 1990s were about 4 ppt. <br />Sulfur hexafluoride is used for insulation in electric power transmission and distribution equipment, in the <br />magnesium industry, in semiconductor manufacturing, and as a tracer gas for leak detection. <br /> <br />Aerosols <br /> <br />Aerosols are particles emitted into the air through burning biomass (plant material) and fossil fuels. Aerosols <br />can warm the atmosphere by absorbing and emitting heat and can cool the atmosphere by reflecting light. <br />Cloud formation can also be affected by aerosols. Sulfate aerosols are emitted when fuel containing sulfur is <br />burned. Black carbon (or soot) is emitted during biomass burning due to the incomplete combustion of fossil <br />fuels. Particulate matter regulation has been lowering aerosol concentrations in the United States; however, <br />global concentrations are likely increasing. <br /> <br />Global Warming Potential <br /> <br />The Global Warming Potential (GWP) was developed to allow comparisons of the global warming impacts of <br />different gases. Specifically, it is a measure of how much energy the emissions of 1 ton of a gas will absorb <br />over a given period of time, relative to the emissions of 1 ton of carbon dioxide (CO2). The larger the GWP, <br />the more that a given gas warms the Earth compared to CO2 over that time period. The time period usually <br />used for GWPs is 100 years. GWPs provide a common unit of measure, which allows analysts to add up <br />emissions estimates of different gases (e.g., to compile a national GHG inventory), and allows policymakers to <br />compare emissions reduction opportunities across sectors and gases. A summary of the atmospheric lifetime <br />and the global warming potential of selected gases are summarized in Table 18. As shown in Table 18, the <br />global warming potential of GHGs ranges from 1 to 22,800. <br /> <br /> <br />596/27/2022 <br />Planning Commission 2 –112