If a chemical coating on a 2000 lbs grain bag was enough to harm children who ate grain stored in the bags, then think about the impact on the person in the coating factory who probably receives a dose 10^9 x bigger without PPE, and probably 10^6 bigger with PPE, because very little PPE keeps out more than 99.9% of whats outside.

Something about the story doesn't add up. Either people are dying every day in the coating factory (unlikely), or the coating, whilst measurable, isn't as dangerous as the article implies.