6. Average annual amount of active ingredient of methyl bromide (A) and chlorpyrifos (B) applied to cropland and pasture area in a county ..
Empirical regression models were developed for estimating concentrations of dieldrin, total chlordane, and total DDT in whole fish from U.S. streams. Models were based on pesticide concentrations measured in whole fish at 648 stream sites nationwide (1992-2001) as part of the U.S. Geological Survey's National Water Quality Assessment Program. Explanatory… (More)