The findings suggested that the plants' NOx emissions could result in a 35% increase in the number of days when ozone levels exceeded the upper threshold set by the US Environment Protection Agency.
He acknowledged that any soil used to grow nitrogen-fixing plants or were fertilised for agricultural reasons would result in an increase in gases involved in the formation of ozone.
If you weighed the changes in ozone by the population distribution of the U.S., you get a net increase in the death rate and hospitalization rate due to ethanol.