Okay, now I understand. I would agree that is what is causing the spikes. We went for a ride all around the area yesterday and spotted several farm lands going through the yearly burn. I must confess, I do love seeing it done because it aids in purifying the soil, plus that means warmer weather is on its sweet way - but hate seeing it done because it pollutes the air. I don't like breathing all that in. Don't know how those who control the burns can stand it.
Thanks for the explanation - I'm always learning something from these threads!
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