To me there is a mixture of things here:

Order SND/351/2020, of April 16th, which authorizes the Armed Forces and Units and Military Emergency Units to use biocide chemicals authorized by the Ministry of Health for disinfection in order to deal with the Covid 19 Health Crisis.
To me it looks like the spraying from trucks that they do a lot in China. It does not work, but they still do it. The more power you give a government, the more crazy they become.

In 2015, four State Meteorological Agency whistleblowers announced via the European Parliament that planes were regularly spraying throughout Spain:
This is more the classical chemtrail kind of stuff. But no further info. Is it a rumor? Or is it about a test-project?

With some background in aviation, am still trying to verify the reality and extend of this. A lot of people seem to mix-up common contrails (standard airplane exhaust) with chem-trails (special chemicals). Normal contrails already start some cloud-formation, but factories and power-plants do this too.