It happened overnight, the same day they switch from long, persistent trails to short non-persistent trails. They had been saturating the sky with chemtrails for years. Then, overnight, the the long trails were short, and they were sprayed at high altitudes.
The very day this happened, something else happened. As someone who can detect viruses and bacteria in the air (yes, there is a small segment of the population who can do this), I detected the scent of virus/bacteria in the air. It stretched over very large areas.
There was only one explanation: It was being released in chemical aerosols ("chemtrails"). This is the only logical, reasonable explanation.
They Explain It All Away
When an artifact of a nefarious activity is in danger of being discovered, the propaganda arm of the government (normally operating through private military contractors) goes into action explaining it away.
In the article below from RT.com, they attempt to explain away the massive deluge of viruses "falling from the sky".
As long as the public believes it's a natural phenomenon, they won't get angry and they won't do anything about it, and that's exactly how the government wants it to be.
The articles below explain the details about smelling chemtrails, and the fateful day when chemtrails turned into "Viraltrails".