Where the EPA does it's slight of hand with ozone is with levels. Yes, ozone is a very powerful substance. Because of that, it does not take much ozone to be irritating to some. But the facts are that the EPA elevates it's amount of ozone in every instance where it tries to prove that ozone is "bad". The EPA even changes the scale for the amount of ozone to make it appear to be worse than it is. Why does the EPA sometimes refer to ozone levels in ppb and other times in ppm? Because that is the EPA's way to confuse the amounts of ozone being tested with claims that ozone is "bad".