"Chinese authorities warned that cyanide levels in the waters around the Tianjin Port explosion site had risen to as much as 277 times acceptable levels although they declared that the city's drinking water was safe."

"Male black bass and some sunfish in North Carolina rivers and streams are developing eggs in their testes, which can cause reproductive problems and potentially threaten populations, according to unpublished research."

"The task of removing lead-contaminated soil from thousands of homes near a closed Vernon battery recycling plant would be the largest cleanup of its kind in California and rank among the biggest conducted nationwide, say environmental officials and experts in toxic remediation."

"A former chemical company executive charged over a spill that fouled the drinking water of about 300,000 West Virginians pleaded guilty to two misdemeanors on Tuesday, according to federal court documents."

Chinese authorities have told news media not to report independently on the hazardous chemical explosion that killed more than a hundred people in Tianjin. No live broadcasting, interpretation, or social media reporting is allowed. Only state-controlled media can be used. Many of the dead were firefighters, who may not have known the hazard they were confronting. There are signs that the Chinese government has been suppressing information about firefighter deaths.

DuPont, a major U.S. chemical company, for years hid what it knew about the threats to employees and neighbors from a chemical -- perfluorooctanoic acid, also known as PFOA or C8 -- that can cause cancer and other health damage. The PFOA was used in operations of DuPont's Washington Works plant in Parkersburg, WV. Its health damage was the focus of a major class-action lawsuit.

"Sixteen companies have reached a $14.3 million settlement with the U.S. Environmental Protection Agency and the state of Maryland to stabilize and cap waste and contaminated soil at the Central Chemical Superfund site in Hagerstown, the agency announced Monday."

"Chinese soldiers and rescue workers in gas masks and hazard suits searched for toxic materials in China's port of Tianjin on Sunday as Premier Li Keqiang arrived to offer condolences, days after explosions flattened part of a national development zone."

"The United States is investigating whether the Islamic State used chemical weapons, the White House said Thursday, following allegations that IS militants deployed chemical weapons against Kurdish forces in northern Iraq."

"On Sunday morning, hundreds of thousands of pounds of toxic gas were accidentally released from the Shell Oil facility in Deer Park [Texas]."