Southern California Air Quality

The environmental impact of SOj emissions has gained much attention over the past ten years. The United States Environmental Protection Agency (EPA) New Source Performance Standards (NSPS) went into effect in 1989. The ruling covers new, modified, and reconstructed FCC units since January 1994. It should be noted that the Southern California Air Quality Management District (SCAQMD) board has established a limit of 60 kilograms of SO per 1,000 barrels of feed for the existing FCC units. 

FIGURE 16.27 Measured ratio of VOC to NO, in the Los Angeles area during the 1987 Southern California Air Quality Study (SCAQS) to that calculated from emission inventories. (Data from Fujita et al., 1992.)... 

These factors combine to make impactors less precise and accurate than filters. Very few comparisons have been made between sizing impactors and those that have provided mixed results. The 1977 Environmental Protection Agency-Department of Energy Sampler Intercomparison included the Multi-Day Sampler, which performed well ( 15%) for fine aerosols such as sulfur, lead, and zinc (15). The 1986 Carbonaceous Species tests at Glendora, California, included the DRUM sampler. It performed well for sulfur ( 18%), as compared to the fine filter sampler (PM-2.5), but no other sizing impactor was available for comparison and no element other than sulfur was reported. DRUM versus filter comparisons were reported as part of the Southern California Air Quality Study of 1987 (2). Again, no other impactor was available for comparison, and the comparisons with filters were only fair (r2 0.7 r, linear correlation coefficient). 

RW. Lurmann, H.H. Main, Analysis cf the Ambient VOC Data Collected in the Southern California Air Quality Study, Final Report to California Air Resources Contract A832-130, Sacramento, CA, 1992. 

As an illustration of the variety of organic compounds identified in the atmosphere, Table 2.11 lists the median concentrations of the 25 most abundant nonmethane organic species measured in the 1987 Southern California Air Quality Study. 

TABLE 2.11 Median Mixing Ratio of the 25 Most Abundant Nonmethane Organic Compounds Measured in the Summer 1987 Southern California Air Quality Study... 

FIGURE 25.7 Air parcel trajectory arriving at Claremont, California, at 2 p.m. on August 28, 1987 (Pandis et al. 1992). SCAQS monitoring stations refer to those established in the 1987 Southern California Air Quality Study. 

J.A. Logan, M.J. Pather, S.C. Wolsy, and M.B. McEhoy,/. Geophys. Res., 86,7210, (1981). F.W.Lurmann andH.H. Main, Analysis ofthe Ambient VOC Data Collected in the Southern California Air Quality Study, final r ort. Contract A832-130, California Air Resources Board, Sacramento, CA., 1992. R. Atkinson, Atmos. Environ., 24A, 1, (1990). 

A high performance polyester containing less than 35% styrene monomer designed for marine laminates and as well as offering excellent surface quality, low shrink, impact and blister resistance meeting the requirements of the Southern California Air Quality Management District Rule 1162 for volatile organic compound resins. 

Pease, R. R., 1984, Status Report on Selective Catalytic Reduction for Gas Turbines, Southern California Air Quality Management District Engineering Division Report, July. 

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