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Environmental Checklist Air Quality Environmental Consistency Checklist Pursuant to CEQA Guidelines Section 15183 27 matter 2.5 microns or smaller in size) standards, and the state PM10 (particulate matter 10 microns or smaller in size) standards and is required to prepare a plan for improvement (BAAQMD 2017a). Clean Air Plan The Bay Area 2017 Clean Air Plan provides a plan to improve Bay Area air quality and protect public health as well as the climate. The legal impetus for the Plan is to update the most recent ozone plan, the 2010 Clean Air Plan, to comply with state air quality planning requirements as codified in the California Health & Safety Code. Although steady progress has been made to reduce ozone levels in the Bay Area, the region continues to be designated as nonattainment for both state and federal ozone standards as noted previously. In addition, emissions of ozone precursors in the Bay Area contribute to air quality problems in neighboring air basins (BAAQMD 2017c). Under these circumstances, state law requires the Clean Air Plan to include all feasible measures to reduce emissions of ozone precursors and reduce transport of ozone precursors to neighboring air basins (BAAQMD 2017c). Air Emission Thresholds The BAAQMD recommends that lead agencies determine appropriate air quality emissions thresholds of significance based on substantial evidence in the record. As the lead agency for this project, the City of San Leandro has determined that the BAAQMD’s significance thresholds in the updated May 2017 CEQA Guidelines are the most appropriate thresholds for use in determining air quality impacts of the proposed project. The BAAQMD developed screening criteria to provide lead agencies and project applicants with a conservative indication of whether a project could result in potentially significant air quality impacts. If the project emissions are below all of the screening criteria, then the lead agency or applicant would not need to perform a detailed air quality assessment of their project’s air pollutant emissions. These screening emission levels are generally representative of what a new development on a greenfield site would produce without any form of mitigation measures taken into consideration. Projects that involve demolition, such as the project, do not meet the BAAQMD construction screening criteria (BAAQMD 2017b). However, the project does meet the BAAQMD operational screening criteria as the project would include the construction of 18 dwelling units which is below the single-family land use criteria screening size of 325 dwelling units. The discussion below analyzing operational impacts is included for informational purposes. As the project does not meet the screening criteria for construction impacts, Table 5 presents the significance thresholds for construction/demolition and operational-related criteria air pollutant and precursor emissions used for the purposes of this analysis. These represent the levels at which a project’s individual emissions of criteria air pollutants or precursors would result in a cumulatively considerable contribution to the Basin’s existing air quality conditions. For the purposes of this analysis, the proposed project would result in a significant impact if construction or operational emissions would exceed any of the thresholds shown in Table 5.