"MONTREAL — Quebecers should be worried that it took 15 years for officials to clue into the fact that a Pointe-Claire company had a yard full of toxic materials, says one environmental expert, and the public should be demanding more transparency in the wake of the discovery."

"An Oakland watchdog group has sued four companies and plans to sue dozens more for allegedly manufacturing or selling shampoos, soaps and other care products without attaching labels warning consumers that they contained high levels of a carcinogen."

"Secretary of State John Kerry said Monday that a large-scale chemical weapons attack occurred in Syria. There are still many questions about chemical weapons, some of which can be answered easily and some of which can't."

"BENTON HARBOR -- While inspecting a house for lead contamination, Steve Weldert came across a child's toy dump truck in a window sill filled with paint chips."

"Even the best national data on chemical accidents is wrong nine times out of 10."

"A Dallas Morning News analysis of more than 750,000 federal records found pervasive inaccuracies and holes in data on chemical accidents, such as the one in West that killed 15 people and injured more than 300."

"In fact, no one at any level of government knows how often serious chemical accidents occur each year in the United States. And there is no plan in place for federal agencies to gather more accurate information.

"California public health officials suggest limiting hexavalent chromium in drinking water to 10 parts per billion. Environmentalists say that's not nearly strict enough."

"At least three people were killed by an ammonia gas leak from a pipeline owned by state oil monopoly Pemex in southern Mexico on Tuesday and 1,500 people were evacuated from the area and taken to shelters, the company said."

"Anti-government activists in Syria are accusing President Bashar al-Assad's forces of deploying a chemical weapons attack on the suburbs of the capital, Damascus. The government denied the attack, but the allegations have prompted the United Nations to call an emergency meeting. Melissa Block talks to Washington Post reporter Loveday Morris for more."

"Quebec's government last week added rail giant Canadian Pacific Railway Corp. to its list of companies deemed responsible for cleanup costs following last month's deadly oil train derailment."

"U.S. drugmaker Merck & Co said on Friday it is suspending sales of its Zilmax animal feed additive in the United States and Canada following concerns about animals showing signs of distress after use of the product, which is given to cattle to increase their weight before slaughter."