Document mQRDkRnG9aKxgLY11mMwbDkO

HI. Air Pollution 'by AeroBols from Vehicle Engines In discussing particulates from motor vehicles ve vill consider only the primary particulates and Ignore the secondary particulates (e.g., photo chemical smog) even though the latter are very important. As seen in Table II, the total mass of primary particulates from motor vehicles is a small part of the pollution from venicles or of the aggregate pollution picture nationwide and world wide. But within a restricted locality, the particulate contribu tion of the automobile can he significant as shown in Table III (from Refs, 4 and 7). Table III. Vehicle particulate emissions and total particulate pollutant emissions in selected urban areas (includes gasoline- and diesel-powered vehicles). Urban area Tons of particulate annually Total Motor vehicles Washington, D. C. 55000 5700 Mew York and North N. J. 251000 55800 Kansas City 60000 5000 Jacksonville, Fla. lljOOO 600 St. Louis 11*7000. 4700 Los Angeles County 45000 16400 In the L. A. area, vehicles contribute an estimated 5& of the total parti culates. An idea of the rate of emissions from an individual vehicle can be ob tained from the following (See Refs. 6, 1, 25); -5- 8000 0619 PRODUCED BY FORD