From the EPA: EPA Authorizes Critical Uses of Methyl Bromide for 2008. It states in part:
This action is authorizing 4,813,452 kilograms (4,813.5 metric tonnes) of methyl bromide for approved critical uses in 2008, with 3,083,769 kilograms supplied from new production or import. Approved critical uses include strawberry and tomato production, as well as commodity fumigation…
Critical use exemptions are permitted under the Montreal Protocol for circumstances where there are no technically and economically feasible alternatives to methyl bromide. Further, the Clean Air Act Amendments of 1990 direct the EPA to issue regulations to implement the provisions of the Montreal Protocol within the United States.
For the full details click on the above link.