Chemtrail patterns

Look up in the sky on a clear day and the sky may not appear so blue. In fact, the sky may have various crisscross patterns of white plum that linger for hours. They don't even seem to dissipate. They sort of expand and cover the sky. What was a sunny day, now, has a opaque glow to it.
These are chemtrails and can only be seen in North America (verified by NASA images). Various theories suggest mass inoculation to weather control by a secret government agency.
Whatever they are it is not natural
This is something more people should be concerned with.