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3. Environmental Checklist San Leandro Treatment Wetland IS/MND 3-7 February 2024 3.4. Air Quality ISSUES: AIR QUALITY POTENTIALLY SIGNIFICANT IMPACT LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED LESS THAN SIGNIFICANT IMPACT NO IMPACT Would the Project: a) Conflict with or obstruct implementation of the applicable air quality plan? ☐ ☐ ☐ ☒ b) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard? ☐ ☒ ☐ ☐ c) Expose sensitive receptors to substantial pollutant concentrations? ☐ ☐ ☒ ☐ d) Result in other emissions (such as those leading to odors) adversely affecting a substantial number of people? ☐ ☐ ☒ ☐ Regulatory Setting Air quality within the City is under the jurisdiction of the EPA and the Bay Area Air Quality Management District (BAAQMD). Alameda County is one of the seven counties that comprise the San Francisco Bay Area air basin. Federal and State Air quality in the area is a function of the criteria air pollutants (CAPs) and toxic air contaminants (TACs) emitted locally, the existing regional ambient air quality, and the meteorological and topographic factors that influence the intrusion of pollutants into the area from sources outside the immediate vicinity. The PPS’s air quality is based on the CAPs meeting the National Ambient Air Quality Standards (NAAQS) and the California Ambient Air Quality Standards (CAAQS). The 1977 federal Clean Air Act (CAA) required the EPA to identify NAAQS to protect public health and welfare. NAAQS have been established for the six “criteria” air pollutants: ozone (O3), carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), respirable particulate matter (PM), and lead. PM is designated into two size classes, coarse (10 micrometers or less in diameter [PM10]) and fine (2.5 micrometers or less in diameter [PM2.5]). The smaller size of PM2.5 allows it to enter the cardiovascular system and cause more serious health problems. For this reason, the NAAQS sets a more stringent standard on PM2.5 in ambient air quality. Pursuant to the 1990 CAA Amendments (CAAA), the EPA has classified air basins (or portions thereof) as either “attainment” or “nonattainment” for each criteria air pollutant, based on whether the NAAQS have been achieved. California has adopted ambient standards that are more stringent than the Federal standards for the criteria air pollutants. Under the California Clean Air Act (CCAA), patterned after the federal CAA, areas have been designated as attainment or non-attainment with respect to CAAQS. The Bay Area’s attainment status for the CAAQS is listed in Table 3-2.