Sentence examples for persistent chemicals from inspiring English sources

But PCBs are persistent chemicals, and their effects are felt even today.

Impacts of pollution by persistent chemicals are considered from a socio-economic point of view.

Dioxins and PCBs are particularly persistent chemicals, which makes them very difficult to break down and dispose of.

According to Greenpeace, both these companies are releasing "hazardous and persistent chemicals with hormone-disrupting properties" into the rivers.

Nonylphenol (NP) compounds are toxic and persistent chemicals that are not fully degraded either in natural or engineered systems.

But this could lead to the widespread use of persistent chemicals outlawed in the United States or targeted for international phase-out.

For the other (less persistent) chemicals, uncertainty in the FF was up to 1 order of magnitude larger than spatial variability.

Recent studies have also found elevated levels of synthetic growth hormones in feedlot wastes; these persistent chemicals eventually wind up in the waterways downstream of feedlots, where scientists have found fish exhibiting abnormal sex characteristics.

The persistent chemicals, used in electrical equipment but banned in the 1980s, are still leaking into the oceans and were also found in extremely high levels in European dolphins, whose populations are in decline.

"These are the most persistent chemicals we are facing today," says Wang. Water and soil near military bases worldwide are rich in PFASs because of fire-fighting foams sprayed there during training exercises.

To refresh that lesson from seventh grade, here's how it works: Animals at the top of the food chain receive the concentrated energy and persistent chemicals of all the biota underneath them.