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page 20 <br />NATIONAL MSAT EMISSION TRENDS 1999 - 2050 <br />FOR VEHICLES OPERATING ON ROADWAYS <br />USING EPA's MOBILE6.2 MODEL <br /> Note: <br />(1) Annual emissions of polycyclic organic matter are projected to be 561 tons/yr for 1999, decreasing to 373 <br />tons/yr for 2050. <br />(2) Trends for specific locations may be different, depending on locally derived information representing <br />vehicle-miles travelled, vehicle speeds, vehicle mix, fuels, emission control programs, meteorology, and <br />other factors <br />Source: U.S. Environmental Protection Agency. MOBILE6.2 Model run 20 August 2009. <br /> <br />The U.S. Environmental Protection Agency has designated all of Hennepin, Ramsey, Anoka and <br />portions of Carver, Scott, Dakota, Washington and Wright Counties as a maintenance area for <br />carbon monoxide. The EAW study area is in Hennepin County that is in this carbon monoxide <br />maintenance area. <br /> <br />The EPA has approved a screening method to determine which intersections need a hotspot <br />analysis. A hot spot analysis is required if the intersection is above the benchmark average <br />annual daily traffic (AADT) threshold or listed as one of the "Top Ten" intersections. All of the <br />top ten intersections are within the Twin Cities carbon monoxide maintenance area. Below is a <br />list of the top ten intersections and their 2007 AADT. <br /> <br />1. TH 169 at CSAH 81 – 79,400 <br />2. TH 7 at CSAH 101 – 66,600 <br />3. TH 252 at 85th Avenue – 66,800 <br />4. University Avenue at Snelling Avenue – 59,700 <br />5. TH 252 at Brookdale Drive – 61,300 <br />6. Cedar Avenue at County Road 42 – 75,100 <br />7. TH 7 at Williston Road – 54,900 <br />8. University Avenue at Lexington Avenue – 59,700 <br />9. TH 252 at 66th Avenue – 72,500 <br />10. Hennepin Avenue at Lake Street – 37,000 <br />55