It's well-documented that both periodic episodes of high ozone exposure and chronic moderate ozone exposure can be harmful to plants, ... We know this from other regions of North America including national parks such as Sequoia and Great Smoky Mountains.  -   David Peterson     Quotes
It's well-documented that both periodic episodes of high ozone exposure and chronic moderate ozone exposure can be harmful to plants, ... We know this from other regions of North America including national parks such as Sequoia and Great Smoky Mountains. David Peterson