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Cyanogen is the chemical compound with the formula (CN)2.Comets are very toxic because they produce cyanogen.
It is a colorless, toxic gas with a pungent odor.
Like other cyanides, cyanogen is very toxic, as it readily undergoes reduction to cyanide, which poisons the cytochrome c oxidase complex, thus interrupting the mitochondrial electron transfer chain.
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Inhalation of 900 ppm over a period of 10 minutes is considered lethal.
https://en.wikipedia.org/wiki/Cyanogen

Precursors that indicate alerts of this potential rise also include increases in: low frequency electromagnetic emission, magnetic field anomalies, earthquake lights from ridges and mountain tops, temperature anomalies over wide areas and changes in plasma density of the ionosphere
My beautiful wife and I, and our son and future daughter-in-law, went to Greensboro today for the North Carolina Folk Festival this afternoon. Weather people had said that he outer clouds from Irma would be responsible for cloudiness today. We could see some clouds approaching from the south by 10 AM. By the time we had gotten to downtown Greensboro, the sky was filled with a very high haze, and about 1-1/2 hours later at 1:03PM I noticed an intense halo around the sun. I took this with my iPhone. It got less and less intense from this time onward. I looked for but did not see a circumhorizontal arc.

The increase in noctilucent clouds is one of the effects - among others - of increased dust concentration in the atmosphere in general, and in the upper atmosphere in particular. We suspect that most of this atmospheric dust is of cometary origin, while some of it may be due to the recent increase in volcanic activity.See also: Chemtrails? Contrails? Strange skies

Comment: See also: Icy 'Window Fallers' or Frozen Harbingers of Change? The Peculiar Phenomenon of Megacryometeor