Here's one link, but all you need to do is search google for "NO2 life expectancy". http://ehp.niehs.nih.gov/isee/p-3-30-13/ http://ehp.niehs.nih.gov/isee/p-3-

Here's one link, but all you need to do is search google for "NO2 life expectancy". http://ehp.niehs.nih.gov/isee/p-3-30-13/ http://ehp.niehs.nih.gov/isee/p-3-30-13/