Less than 1% of 300,000 environmentally relevant chemicals in the US have monitoring data

A sewage pipe empyting into a river near some buildings

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The actual number of chemicals tracked may be even lower 

An analysis of US surface water monitoring records has found that less than 1% of chemicals of potential environmental concern have suitable monitoring data available. The researchers said the findings highlighted both the shortcomings of, and prospects for, macroscale chemical risk evaluations in the US and globally.