the types of chemicals used could be quite different and have different effects on health. The cloud seeding process uses silver iodide most commonly, calcium chloride, salt compounds, or dry ice (frozen CO2) http://science.howstuffworks.com/nature/climate-weather/mete... . I don't know what impacts these chemicals can have on nature / human health nor do I know how they diffuse once released. It sounds like chemtrails hang around for a long time and take a long time to disperse, but since the above-mentioned chemicals are used in cloud seeding, I would guess they relatively quickly fall into the cloud from above due to the force of gravity. (The aircraft fly above the clouds.)
I am not an expert on cloud seeding. I just know it exists, and I want other people on this board to be aware.
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