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Administrative Draft Environmental Impact Report Gill Medical Center Project emission reductions would be considered a significant impact. Implementation of Mitigation Measure 4.5-2b would reduce this impact to less than significant as discussed below. Since the Project's emissions do not exceed SJVAPCD thresholds, no exceedance of the ambient air quality standards would occur, and no health effects from Project criteria pollutants would occur.As identified in Table 4.5-3, the SJVAB is listed as a nonattainment area for federal 03 and PM2.5 standards and is also a nonattainment area for the state standards for 03, PM1o, and PM2.5. 03 is a health threat to persons who already suffer from respiratory diseases and can cause severe ear, nose and throat irritation and increases susceptibility to respiratory infections. Particulate matter can adversely affect the human respiratory system. As shown in Table 4.5-6, the Proposed Project would result in increased emissions of the 03 precursor pollutants ROG and NOX, PM10, and PM2.5, however, the correlation between a project's emissions and increases in nonattainment days, or frequency or severity of related illnesses, cannot be accurately quantified.The overall strategy for reducing air pollution and related health effects in the SJVAB is contained in the SJVAPCD's various air quality management plans previously described. These air quality management plans provide control measures that reduce emissions to attain federal ambient air quality standards by their applicable deadlines such as the application of available cleaner technologies, best management practices, incentive programs, as well as development and implementation of zero and near-zero technologies and control methods. The CEQA thresholds of significance established by the SJVAPCD are designed to meet the objectives of regional air quality planning efforts and in doing so achieve attainment status with state and federal standards.As noted above, the Project would increase the emission of these pollutants, but with implementation of Mitigation Measure 4.5-2b would more than exceed the emission reduction thresholds of significance established by the SJVAPCD for purposes of reducing air pollution and its deleterious health effects. Therefore,with implementation of Mitigation Measure 4.5-2b, this potential impact would be less-than-significant with mitigation incorporated. Mitigation Measures 4.5-2a: Prepare Air Impact Assessment to Reduce Construction NO. Emissions In accordance with SJVAPCD Rule 9510, a detailed air impact assessment (AIA) shall be prepared detailing the specific construction requirement (i.e., equipment required, hours of use, etc.). In accordance with this rule, emissions of NO,,from construction equipment greater than 50 horsepower used or associated with the development Project shall be reduced by 20 percent from baseline (unmitigated) emissions and PM10 shall be reduced by 45 percent. The Project shall demonstrate compliance with Rule 9510, including payment of all applicable fees, before issuance of the first building permit. While the specific emission reduction measures will be developed to the satisfaction of the SJVAPCD, the following measures would reduce short-term air quality impacts attributable to the Proposed Project consistent with Rule 9510: ■ During all construction activities, all diesel-fueled construction equipment including, but not limited to, rubber-tired dozers, graders, scrapers, excavators, asphalt paving Air Quality 4.5-19 October 2021