There is lots of talk on the net that there is a arosol spraying operation going on but I am not sure about that. Are there any aviation experts or knowlagable folks who could fill me in?
As Internet expert I can tell you, that using the Internet and publish texts has become so easy, that even idiots can do it.
Still, all is just the usual conspiracy theory nonsense, the only case in which aerosols are intentionally (aside of any combustion engine exhaust being an aerosol) by spraying them into the air at higher altitude (not crop dusting, which is also aerosols), had been the tests on the US Stealth aircraft for
suppressing the formation of contrails.
Not used today, but the B-2A had such equipment installed during the prototype phase. The tests had not been successful, the chemicals made the contrail less visible for a short time, but had been much more visible on weather radar. The aircraft designers found out, that a simple lightweight sensor at the aft end of the aircraft, that warns the crew if they produce contrails, so they can change the altitude and fly into warmer or less humid air, is lighter and cheaper...and does actually work.
http://www.airspacemag.com/flight-today/Flight_Lines.html