COPPER INPUT (mg m* 2 y-‘) 
io 4 
io 2 
IO ' 1 
IO* 1 I IO IO 2 IO 3 IO 4 
LEAD INPUT (mg m^y* 1 ) 
Figure 3. Comparison of Annual Mass Loading of Copper and Lead to Boston Harbor 
with that of Other Estuaries for which Data are Available. Modified from 
Nixon et al., 1986. 
Hudson Raritan Bay 
• 
BOSTON HARBOR ★ 
Narragansett Bay 
• 
South San Francisco • 
Bay 
• Chesapeake Bay 
Delaware 
Bay 
( 
Southern California 
Bight 
• 
_ South Atlantic 
Bight 
1 1 
42 
