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Air quality monitoring is performed by local and state air quality control agencies in order to determine whether the air meets quality standards set by both the federal and state governments. The National Ambient Air Quality Standards (NAAQS) are set by the United State Environmental Protection Agency (EPA) . The state standards are set by the California Air Resources Board (ARB) . When state and federal air quality standards are not identical, local air pollution control agencies are required to develop plans to ensure that the more stringent standards are met. In the San Joaquin-Stanislaus Air Quality Maintenance Area (AQMA) , the ARB projected that the air quality standards would not be met by 1980 for either photo-chemical oxidants or total suspended particulates (1) . Table 1 lists the air quality standards for these two pollutants. The hourly standard for oxidant and the 24-hour average for Total Suspended Particulates are not to be exceeded more than once per year. The National Ambient Air Quality Standards are the ones that federal regulations require meeting in the Air Quality Maintenance Planning process. TABLE 1 Air Quality Standards for Pollutants Included in the San Joaquin-Stanislaus AQMA Pollutant Averaging Time National Standard State Standard Oxidant 1 hour 0.08 PPM 0.10 ppm3 Total Sus- 24 hours 260 ug/m100 ug/11 pended Annual Geometric 75 ug/m3 60 ug/m Particulates Mean Air quality monitoring has been performed in San Joaquin County by the ARB and the San Joaquin Air Pollution Control District (APCD) . The location of the single monitoring station for San Joaquin County is at 1601 East Hazelton Street. Photochemical oxidents are formed when two pollutant species, reactive hydrocarbons and oxides of nitrogen, react in the presence of sunlight to form a new group of compounds, photochemical oxidents. The reactive hydrocarbons and oxides of nitrogen emissions are largely attributed to the internal combustion engine.