I'll give this a try and then get back to explaining how it is measured.
It's killing all sea animals in a huge area of the gulf. Some are creatures we eat. If we know the source, we may be able to determine ways to reduce it. Fisherman and shrimpers back in business.
You have apparently missed those tv commercials from the southern states affected by the oil platform spill. The spokes-person for each state and area go on the record in the commercials that the clean up is done, the beaches are open, the restaraunts are brimming with capacity. That means fisherman and shrimpers are back in business.



