Sorry Charles, but your misconception is likely your own misconception. You forget about global pollution.  

Point taken Professor,  if your target has to be Zero,  it may be a stretch. 

I was referring more to the constant exposure from lawn and Ag chemicals, especially during that critical growing season.  That’s one of the things that always astounds me flying out to CA,  how much area there is where there is literally nothing....huge tracts of ground.


Charles

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