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I Munn E Perkins Quarry Excavation Permit I Odorous Emissions Though offensive odors from stationary sources rarely cause any physical harm, they still remain unpleasant and can lead to public distress generating citizen complaints to local governments. The occurrence and severity of odor impacts depend on the nature, frequency and intensity of the source;wind speed and direction;and the sensitivity of receptors.Generally, increasing the distance between the receptor and the source will mitigate odor impacts. Greenhouse Gases Gases that trap heat in the atmosphere are called greenhouse gases(GHGs). The accumulation of GHGs in the atmosphere has been linked to global climate change. Global climate change is a change in the average weather conditions on earth that can be measured b wind patterns,storm g � y P � s, precipitation,and temperature.GHGs include all of the following naturally-occurring and anthropogenic (man-made) gases: carbon dioxide (CO2), methane, nitrous oxide (N20), sulfur bexafluoride, perfluorocarbons,hydrofluorocarbons,and nitrogen trifluoride(NF3)(California Health and Safety Code§38505(g)).CO2 is the reference gas for climate change.To account for the warming potential. of GHGs,and to combine emissions of gases with differing properties, GHG emissions are typically quantified and reported as CO2 equivalents(CO2e). Potential global warming impacts in California could include loss in snow pack, sea level rise, more extreme heat days per year,more high ozone days,more large forest fires,and more drought . years. Secondary effects are likely to include a global rise in sea level, impacts to agriculture, changes in disease vectors, and changes in habitat and biodiversity. Regulatory Setting and Applicable Air Quality Regulations Federal The Federal Clean Air Act(FCAA)requires the U.S. Environmental Protection Agency(USEPA) to identify National Ambient Air Quality Standards(NAAQS or national standards)to protect public health and welfare.National standards have been established for ozone,carbon monoxide, nitrogen dioxide, sulfur dioxide,PM 10, PM2.5, and lead. Table 3.3-2 shows current national and state ambient air quality standards and provides a brief discussion of the related health effects and principal sources for each pollutant. Munn&Perkins Quarry Excavation Permit 3.3-6 ESA 1211086 Draft EIR April 2011