The sulfur content of ULSD is so hard to get down to
that 4.7 million barrels per day of crude oil from USA wells is sold overseas
out of over 12 million barrels per day of USA production

https://www.msn.com/en-us/money/mar...ports-tick-production-higher/ar-AA19qNe7

This is all part of the “hidden cost” of our NOx pollution laws.

Not one in hundred US citizens is aware of the vast cost of all this
and not one in a thousand citizen is aware of what shaky ground the science of NOx as a pollutant is.

We dump vast quantities of Urea fertilizer on the ground which creates NOx in air.