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lie 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 . Thirteen of the facilities are in the small category (emissions greater than 5 ton/yr) , which requires an emissions inventory once every 3 years . The locations of the permitted facilities in the County are as follows : • Chapel Hill 4 • Carrboro 2 • Hillsborough 6 • Mebane 7 • Rougemont 1 The largest emissions of HAPs reported for 1997 were as follows : • UNC at Chapel Hill (Cameron Ave . ) 75 : 07 tons/yr • General Electric Corp . (Mebane) 8 . 94 tons/yr • AKG of America (Mebane) 4 . 48 tons/yr • Nameplate (Hillsborough) 2 . 80 tons/yr Other sources of air contaminants in the county are do not need permits to operate due to their small volume of emissions . The contributions of fugitive emissions from some sources , such as dust from agricultural operations and construction sites are difficult to estimate . There are no regulatory requirements in the State of North Carolina to address control of fugitive emissions , such as particulate matter, from agricultural , construction, or open burning activities . Emissions from these sources can be estimated, but it is difficult to quantitatively determine the impact of these sources on air quality in the County . 2 . 4 . 2 Mobile Sources Mobile sources include on-road sources such as cars , trucks , and buses and off-road vehicles such as construction equipment (tractors , earth movers) . Both sources are important . But the on-road sources have a substantially larger impact on air quality due to the large number of vehicles and vehicle miles traveled . 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/profileI /transport . htm) demonstrates the increasing reliance on automobiles as a source of transportation for County residences . SOCF analyzed the following three measures , auto availability , modal choice, and vehicle miles traveled (VMT) : • Auto Availability - SOCF reported that 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 . 7