The chemicals are joining twelve other substances that are already banned under a treaty known as the Stockholm Convention.

VOA: special.2009.06.23

Miss Carson and other scientists were very concerned about the harmful effects of DDT and other insect-killing chemicals called pesticides.

VOA: special.2010.03.14

It can also contain other pollutants like chemicals from agriculture and industry.

VOA: special.2010.07.19

In studying babies' brains, the researchers found that babies who died of SIDS had 25 percent less serotonin and related chemicals than the babies who died of other causes.

VOA: standard.2010.02.08