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Compared to adjacent counties , there are a few stationary sources , permitted by the State , located in Orange - County, as shown below . cognix Number of Permitted Facilities Orange 20 Alamance 159 Chatham 69 Durham 163 Person 36 Wake 309 Of the 20 permitted facilities in Orange County, only the University of North Carolina is listed in the Title V category, which requires an annual emissions inventory because the emissions are greater than 100 ton/yr . The University ' s power generation facility on Cameron Avenue is the largest permitted stationary source in the County . Mobile sources are a more significant source of air pollution in the County than stationary sources . Shaping Orange County ' s Future ( SOCF) performed analyses of various transportation issues for the County . Data from their work (available at on the Internet at www. co . orange . nc . us/shaping/profilel /transport . htm) demonstrates the increasing reliance on automobiles as a source of transportation for County residences . SOCF analyzed the following three measures . • Auto Availability - In 1960 there were 12 , 933 vehicles registered in Orange County with a ratio of 3 . 32 persons per vehicle . By 1990 , there were 65 , 900 vehicles with a ratio of 1 . 57 persons per vehicle . • Modal Choice - U . S . Census data for 1980 showed that approximately 60 % of the County ' s working population drove to work alone , 23 % carpooled and the other 17 % used public transit, walked, motorcycled, or bicycled . But by 1990 , 72 % of the working population drove alone and only 14 % carpooled . • Vehicle Miles Traveled - The total number of vehicle miles traveled (VMT) on Orange County roads increased by 80 % from 1 , 727 , 000 in 1987 to 3 , 114 , 000 in 1997 . When SOCF accounted for population growth during the period, the actual percent increase in average daily VMT was estimated to be 43 % . In 1997 , per capita VMT averaged 28 miles per person per day compared to 20 miles per person per day in 1987 . The importance of mobile sources in the County was demonstrated in the Air Quality summary prepared by the SOCF . Their analyses showed that 73 % of the emissions of nitrogen oxides , which are ozone precursors , were from on-road mobile sources and only 6 % of the NOx emissions were from point (stationary) sources (Figure 1 ) . Relative to stationary sources, mobile sources are likely to continue to be much more important when addressing air quality concerns in the County . The data suggest that the County can have the greatest impact on air quality by addressing transportation issues in the County and Triangle Region. 111