It's conifer's terpenes that cause the haze* in the great smoky mountains. https://www.livescience.com/46958-trees-ozone-pollution-map.html https://www.livesci

It's conifer's terpenes that cause the haze* in the great smoky mountains. https://www.livescience.com/46958-trees-ozone-pollution-map.html https://www.livescience.com/46958-trees-ozone-pollution-map.... (*not the same as smog, you need NOx emissions as well for that to form)