Your tone suggests you think they are generally not based on science and given cost benefit analysis. Probably a reflection of your media intake.

In 1981 Reagan made cost benefit analysis a requirement for EPA.

For example in 1984: the EPA " estimates that the benefits of reducing lead in gasoline would exceed the costs by more than 300 percent.... These benefits include improved health of children and others"

Trump has just scrapped the requirement to cost in human health.

I wonder if removing lead would meet the new standard.