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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 34 north valley is in the low 90ºs. Winters are mild and humid, temperatures below freezing are unusual and the average daily low temperature is 45ºF. Average annual rainfall is approximately 20 inches in the north part of the air basin, and the majority of the precipitation is produced by winter storms. The topographic features in the area restrict air movement through and out of the basin, leading to air pollution becoming trapped for long periods of time and producing harmful levels of pollutants. Local climatological effects, including wind speed and direction, temperature, inversion layers, and precipitation and fog, can exacerbate the air quality problem in the SJVAB. The SJVAB is classified “severe nonattainment” for the state and the federal ozone standard and “serious nonattainment” for the federal PM10 standard. 3.3.2.2 Air Quality Management District Standards Bay Area Air Quality Management District. The BAAQMD does not require quantification of construction emissions, although a Lead Agency may elect to do so. If all of the control measures indicated in Table 2 of the “Bay Area Air Quality Management District California Environmental Quality Act Guidelines” (as appropriate, depending on the size of the project area) will be implemented, then PM10 emissions from construction activities would be considered a less than significant impact (BAAQMD 2017). Sacramento Metro Air Quality Management District. Because the Sacramento region exceeds state and federal ozone ambient air quality standards, ozone precursors such as nitrogen oxide are of greatest concern in the district. A project is considered significant if anticipated emissions of certain pollutants exceed, or contribute substantially to, an existing or projected violation of an ambient air quality standard, or expose sensitive receptors (e.g., children, athletes, elderly, sick populations) to substantial pollutant concentrations (SMAQCD 2019b). San Joaquin Valley Air Pollution Control District. The SJVAPCD’s approach to California Environmental Quality Act analyses of construction PM10 impacts is to require implementation of effective and comprehensive control measures rather than to require detailed quantification of emissions. The SJFAPCD has determined that compliance with Regulation VIII for all sites and implementation of all other control measures indicated in Tables 6-2 and 6-3 of the “San Joaquin Valley Air Pollution Control District Guide” will constitute sufficient mitigation to reduce PM10 impacts to a level considered less than significant with mitigation (SJVAPCD 2015). Yolo Solano Air Quality Management District. The YSAQMD sets project-level thresholds for pollutants of concern, toxics, odors, and cumulative impacts. Even projects not exceeding the district PM10 thresholds should comply with applicable district rules and implement best management practices to reduce dust emissions and avoid localized health impacts (YSAQMD 2007). Thresholds of significance for criteria pollutants in the four air quality management districts are displayed in Table 3. The Air Districts have established screening levels to