Toxic streams

Down to Earth - - SCIENCE - PNAS, April 13

A GLOBAL study of pes­ti­cides in streams and wa­ter­ways states that such pol­lu­tion is rare, but when found, it ex­ceeds reg­u­la­tory lim­its about half the time. Of the 2,500 aquatic sites cov­ered in the study, just 2.6 per cent of the sam­ples con­tained mea­sur­able lev­els of in­sec­ti­cides. At the sites con­tain­ing in­sec­ti­cides, 52.4 per cent of the de­tec­tions ex­ceeded reg­u­la­tory thresh­olds. In fact, the high lev­els of pes­ti­cide con­tam­i­na­tion con­sti­tuted an ex­ces­sive threat to aquatic bio­di­ver­sity.

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