Sheldon Whitehouse actually said...

As many people in the audience know, Senator Collins has an abiding concern for this issue.

Just one additional point--presumably, these rules were all put in place with a good intention.

So if you go to a purely monetary standard, you are likely to understate the benefits.

I distinctly remember driving to work in the morning on a nice summer day and hearing the radio station tell me that today is a bad air day ...