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28 <br /> stationary sources in the adjacent counties . Data on the mass of pollutants emitted by each <br /> permitted facility is available , but compilation of the data was beyond the scope of this report . <br /> itted facilities in Orange County, only the University of North Carolina is <br /> Of the 20 perm <br /> listed in the Title V category, which requires an annual emissions inventory because the <br /> emissions are greater than 100 ton/yr . The University' s power generation facility on Cameron <br /> Avenue is the largest permitted stationary source in the County. Thirteen of the facilities are in <br /> the small category ( emissions greater than 5 ton/yr) , which requires an emissions inventory once <br /> every 3 years . The locations of the permitted facilities in the County are as follows : <br /> g) Chapel Hill 4 <br /> h) Carrboro 2 <br /> i ) Hillsborough 6 <br /> j ) Mebane 7 <br /> k) Rougemont 1 <br /> The largest emissions of HAPs reported for 1997 were as follows . <br /> 1) UNC at Chapel Hill ( Cameron Ave . ) 75 . 07 tons/yr <br /> m) General Electric Corp . (Mebane) 8 . 94 tons/yr <br /> n) AKG of America (Mebane) 4 . 48 tons/yr <br /> o) Nameplate (Hillsborough) 2 . 80 tons/yr <br /> Other sources of air contaminants in the county are do not need permits to operate due to <br /> their small volume of emissions . The contributions of fugitive emissions from some sources , <br /> such as dust from agricultural operations and construction sites are difficult to estimate . There <br /> are no regulatory requirements in the State of North Carolina to address control of fugitive <br /> emissions , such as particulate matter, from agricultural , construction, or open burning activities . <br /> Emissions from these sources can be estimated , but it is difficult to quantitatively determine the <br /> impact of these sources on air quality in the County. <br /> 2 . 4 . 2 Mobile Sources <br /> Mobile sources include on-road sources such as cars , trucks , and buses and off-road <br /> vehicles such as construction equipment (tractors , earth movers) . Both sources are important . <br /> But the on-road sources have a substantially larger impact on air quality due to the large number <br /> of vehicles and vehicle miles traveled . <br /> Shaping Orange County ' s Future ( SOCF) performed analyses of various transportation <br /> issues for the County. Data from their work ( available at on the Internet at <br /> www . co . orange . nc . us/shaping/profile1 /transport . htm) demonstrates the increasing reliance on <br /> automobiles as a source of transportation for County residences . SOCF analyzed the following <br /> three measures , auto availability, modal choice , and vehicle miles traveled (VMT) : <br /> 8 <br />