If you are worried about barium exposure Elvis , you get much more from composite fillings than from the air . In general, indoor air is far more toxic than outdoor air .
I didnt watch the videos but it seems to me that one reason why the exaust from different planes is different is that they are using different fuels , perhaps because some are cheaper and perhaps more toxic. I don't know about England but here in the states most of our rich powerful people live in big cities so they are exposed to whatever is in these chemtrails.I did read one article and in it several people claimed that these planes go nowhere; they simply criss cross the sky.Given the speed of an airplane, how would onlookers know that the same planes were criss crossing the sky rather than heading somewhere .Even if planes are circling around, they might be training pilots .