Editor’s note, June 29, 2015: Workers in America face risks from toxic exposures that would be considered unacceptable outside the job — and in many cases are perfectly legal. Today, in the first installment of a series, we reveal how regulators are still struggling to protect workers from lung-damaging silica 40 years after being warned about it, and show, in a new analysis, the high cancer risks posed by a variety of chemicals. The second part of the series focuses on the potential harm unborn children face from their parents’ exposures. Next week, we examine the struggles that have plagued the Occupational Safety and Health Administration since it opened its doors 44 years ago. Additional stories will appear later this year. Join the conversation on our Worker Safety Facebook group.