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A Particulate matter is an irritant, mainly affecting the eyes and ' upper respiratory tract. Particulates can also serve as a vehicle for the transport of nitrogen and sulfur oxides into the lungs, resulting in more damage than that which would occur from these chemicals acting independently. By themselves , sulfur oxides can irritate the respiratory tract. However, sulfur oxides combined with particulate matter are associated with the only recorded air pollution episodes during which large numbers of people died. EXISTING AIR QUALITY: Ozone, (Stockton/Hazelton Station Data) During the period 1980 - 1982, there were nine days during which the national ambient air quality standard (0.12ppm, 1-hr. avg.) was reached or exceeded. Trend data indicate that mean maximum hourly concentrations of ozone have been dropping since 1979 [9, p. 20]. In 1983, C.A.R.B. data indicate only four days exceeded 0.12 ppm, 1-hr. avg. [10]. Carbon Monoxide (Stockton/Hazelton Station Data) During the period 1980 - 1982, there were eight days during which the national ambient air quality standard (9.0 ppm, 8-hr, avg. ) was exceeded. Trend data indicate that the three-year running mean concentration has been dropping consistently at an approximate rate of 0.2 ppm per year (9, p. 23). In 1983, C.A.R.B. data indicate only one day exceeded 9.0 ppm, 8-hr. avg. [10]. In order to be designated as an attainment area for carbon monoxide, the County must have eight consecutive violation-free quarters. This occurred in 1981-82 and redesignation has been discussed with the CARB. CARB is now evaluating data from a new monitoring station which began operation in December, 1982 [9, p. 26]. Total Suspended Particulates (Stockton/Hazelton Station Data) y w The most recent data available is from the CARB. The annual summary for 1983 indicates that 17 days that year exceeded the state standard of 100 micrograms per cubic meter, 24-hr. avg. [10]. IMPACT: The most important effect that the project would have on air quality would be due to vehicular emissions. 4rom the traffic study, the estimated average daily number of trip ends from full build-out of the project would be approximately 13,310. Based on recent estimates by the CARB, the average trip length for passenger cars and pickups in San Joaquin County will be 7.31 miles during 1990 - 1995 (Ed Yotter, telecon). Using motor vehicle emission predictions by CARB, the following presents vehicle emission estimates with full build-out of the project (See Appendix 0-1). 40