Primary standards are meant to determine healthy levels, including for vulnerable people like children and the elderly. They are not intended to determine what

Primary standards are meant to determine healthy levels, including for vulnerable people like children and the elderly. They are not intended to determine what levels are economically efficient. That's handled during implementation, not when setting the primary standards. So the EPA does consider it, they just do it in a later step. "Garbage in, garbage out," so you want to make sure your medical science is accurate when it goes into the economic analysis. https://news.ycombinator.com/item?id=34376218 https://news.ycombinator.com/item?id=34376218