Normal ozone levels are routinely between 30-50 ppb on a clear day in most of America. Cities such as Houston can have ozone levels over 300 ppb during the summer. Most cities have atmosphere monitoring websites, particularly useful for those with allergies, that report things like ozone levels.
posted on 08/18/2011 7:05:25 PM PDT
by culper jr
(We need to stop our modern day Benedict Arnold.)
To: culper jr
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson