If in fact the principal culprit is ethanol that is actually good news, since we can just stop using it. Of course ozone is still a problem, but it’s so bad now, I can hardly believe my own eyes. I went to Princeton yesterday and those huge old trees look terrible, it’s so sad.

Your region has the highest injury level:
EPA: Ozone Injury In Plants

University Of Minnesota: Entering the O(no!)zone
Ozone is the probably the most common and most damaging form of air pollution. It is a highly reactive form of oxygen that causes a variety of symptoms. Foliar symptoms include flecking (silver or bleached-out spots), tissue death between the veins, stipple (numerous tiny spots of yellow, light tan, red-brown, dark brown, red, black, or purple pigment), mottling (irregular blotches of green, light green, and yellow), yellowing, bronzing, or bleaching. Plant growth may be stunted if foliar symptoms are severe. Flowering and bud formation can be depressed or aborted.