Open the HTML destination. PATH= specifies the ODSOUT fileref as the HTML destination for all the HTML and GIF files produced by the program. BODY= names the HTML file for storing the drill-down plot. NOGTITLE suppresses the graph title from the SAS/GRAPH output and displays it through the HTML page. ODS will automatically assign anchor names to each piece of output that is generated while the HTML destination is open. 
ods html path=odsout
         body='city_plots.html'
         nogtitle;