There's a site called chemtrails.news if you're interested in learning more about them. As far as I know they're spraying stuff like sulfur dioxide, alumina, calcium carbonate, etc... for weather manipulation. The main stream media (like New York TImes) actually used to discuss weather manipulation during the 1980s but im sure they're keeping it quiet to progress weather control tech.
For example- Irma
http://www.chemtrailsnews.com/2017-09-10-claim-hurricane-irma-a-man-made-storm-created-via-weather-weaponization-technology-new-video-released.html
There's literally poison everywhere.