Changes

So far none of the aforementioned substances was identified clearly in contrails or jet exhaust fumes.

So far none of the aforementioned substances was identified clearly in contrails or jet exhaust fumes.

Speculations by anti-vaccination activist Anita Petek-Dimmer became a source of amusement in 2005, when she proclaimed that birds' flue (caused by the H5N1 virus) was the result of ionizing radiation from chemtrails. Petek-Dimmer believed that plutonium was added to chemtrails. Furthermore she assumed: ''This radioactive radiation does not only dissolve animal cells, but also those of plants.<ref>A. Petek-Dimmer: Vogelgrippe oder Vogelwahn. Wie man mit gezielter Propaganda Angst und Hysterie erzeugt. AEGIS IMPULS Nr. 23 2005</ref>

Speculations by the late anti-vaccination activist Anita Petek-Dimmer became a source of amusement in 2005, when she proclaimed that birds' flue (caused by the H5N1 virus) was the result of ionizing radiation from chemtrails. Petek-Dimmer believed that plutonium was added to chemtrails. Furthermore, she assumed: ''This radioactive radiation does not only dissolve animal cells, but also those of plants.<ref>A. Petek-Dimmer: Vogelgrippe oder Vogelwahn. Wie man mit gezielter Propaganda Angst und Hysterie erzeugt. AEGIS IMPULS Nr. 23 2005</ref>

==Known releases of substances in aviation==

==Known releases of substances in aviation==