animal feed not cars kills this town

in the san juaquin valley, animal feed is the production of smog not cars or other fossil fuel burners. the animal feed given to cows works with automotives exaust to create ozone. this town is a smog hotspot because of this. this town produces 10 percent of americas food. it has puzzzled scientists because of its few automobiles but high smog levels.
this is very interesting because the smog could kill the animals reducing the food income for the united states. people should create a animal feed that doesnt have the chemicals that mix woth the feed and create ozone.