The reflective sprays don't evaporate, they spread out dramaticly in minutes. In the first moments they have a slight tooth comb quality to them and then they widen.
Their behavior is vastly different from vapor trails.

Why should the goverment leave themselves open to every person with bronchitus claiming they are poisoned and file a class action suit?

SO far the chemtrail spray program has lowered heat levels temporarily by 10 %.

What they do to the enviorment or the birds and bees is not clear.

Naw, this story will be avoided.