Right. There is pollution in the air and jet exhaust is also a polluting substance. What's the mystery? Without a control group, one cannot determine the source of the pollution. Cars produce pollution. Factories produce pollution. As a matter of fact, I've read that a large amount of the pollution that appears on the West Coast originates in China. Yes, pollution travels. Human beings breathing and shedding skin produces a surprising amount of polluting particulates.
Contact 'Evergreen', find out what they use in their cloud-seeding and then apply that information to air and soil samples. However, you'd also have to find a near identical geographical location that has absolutely no air traffic to compare, wouldn't you.
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