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The East-West Divide <br />R ; , . l Product Use Translates t Large Differences 'in PAH Concentrations <br />Ownt M_ <br />310�O <br />iN Haver <br />1110 <br />,D.C. <br />Goncentrations� of PAHs in dusts eptfrorru sealed parking lots in <br />central and eastern U.S. cities, where coa I As r-based-ses I cost <br />use dorninates,,were about'l.000firries higher than inl western <br />U.S., cities, where asphalt-biased-sealllcoat use dominates. <br />Concentratons shown on the map are the sum of 12 PAHs, in <br />Milligrams per kilograrn (Van Metre and others, 2,,009). <br />a IM <br />"Fingerprinting"' Shows that Coal-Tar Sealant 'is the Largest Source of PAHS to <br />irban Lakes <br />WIN <br />80 <br />60 <br />40 <br />20 <br />0 <br />Coal-tar,-based sealcoait <br />Veh�icle-rella�ted sources 0 <br />...... . ... �A�«9i ����„ <br />-0— Wood combustion <br />....... lill).- ..... Fuel oil combustion & <br />Coa l combustion <br />46 <br />.................... i�� <br />1930 1950 19710 1990 2010 <br />Coal-tar-based sealcoalt Jorange symlboll) is the largest cointributor <br />to, increasinlg concentrations of PAHIs in Lake Killarney, Orlando, <br />Florida, as determined by chernical fingerprinting. Simli'�lar patterns <br />were seen in lalkes across the central and eastern Uinited States <br />(Vans Metre a n d M a h I a r, 2010). <br />