-11- 



standard, and all sites have experienced ozone levels at least 

 35 percent higher than the standard. 



To reduce the hydrocarbon emissions which contribute to the 

 formation of ozone, a set of regulations based on reasonably 

 available control technology has been implemented in Mecklenburg 

 County to reduce emissions from existing stationary sources 

 (petroleum storage facilities, industrial processes, etc.), and 

 even more stringent control regulations apply to new stationary 

 sources. At the same time, the hydrocarbon emissions from motor 

 vehicles are being reduced as newer motor vehicles v;ith more 

 effective emission control systems replace older vehicles which 

 have higher emission rates. Through these emission reductions from 

 stationary sources and motor vehicles, the exceedances of the ozone 

 standard are expected to be eliminated by the end of 1982. 



Unlike ozone, carbon monoxide is emitted directly from motor 

 vehicles and, thus, is characterized by significantly different 

 dispersion and transport properties. Over 90 percent of the 

 carbon monoxide in Mecklenburg County results from motor vehicle 

 activity while the remaining portion comes from certain industrial 

 processes, residential v/ood burning, and other sources of combustion 

 Carbon monoxide levels are currently monitored continuously at three 

 locations in Mecklenburg County (at the Federal Reserve downtown, 

 near Park-Woodlawn intersection, and near Central-Sharon Amity 

 intersection) and have been monitored at five other locations. 

 All of the monitoring sites have recorded violations, i.e., carbon 

 monoxide levels above the national standard, v;ith the higher levels 

 beina about twice the standard. These high levels have usually 



