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Primary pollutants are emitted from numerous sources such as <br /> "Mobile Sources" (cars , trucks, and buses) ; "Stationary Sources" <br /> (industrial plants) ; "Other Mobile Sources" (airplanes, boats, <br /> motorcycles, off-road vehicles) ; and "Area Sources" (agricultural burns, <br /> home space heaters, dry cleaners, and gas powered lawn mowers) . Many of <br /> these sources emit individually small but collectively large amounts of <br /> pollution over a large geographic area. <br /> Emission sources in San Joaquin County have been categorized into <br /> mobile, stationary, and area sources. The table below shows 1979 <br /> emissions by these three classifications. <br /> 1979 Emissions by Classification <br /> Tons/Day <br /> Classification ROG CO NO <br /> Mobile Sources 30.30 223.40 34.00 <br /> Stationary Sources 23.57 .05 .01 <br /> Area Sources 44.64 87.72 22.44 <br /> TOTAL 1979 98.51 331.17 56.45 <br /> Based on the AQMP's growth projections, emission projection for <br /> 1987 are shown in the following table: <br /> 1987 Projected Emissions by Classification <br /> Tons/Day <br /> Classification ROG CO NO <br /> Mobile Sources 16.90 171.18 25.70 <br /> Stationary Sources 23.96 .46 .41 <br /> Area Sources 45.39 91.32 23.32 <br /> Total 1987 86.25 262.96 49.43 <br /> The term "air quality" refers to the result of emissions of various <br /> pollutants into the atmosphere when acted upon by certain meterological <br /> conditions. The effect of stable air or atmospheric stagnation on air <br /> quality may assume particular significance if population centers <br /> increase in size as projected. A potentially serious condition in the <br /> Central Valley could occur in winter when there is little ventilation of <br /> the valley by coastal winds. This type of weather is frequently <br /> associated with the tule fog regime, when temperature inversions persist <br /> 3. Large amounts o certain hydrocarbons are emitted naturally in <br /> forested regions. <br /> 37 <br />