Thread Hijack - Folk myth or truth.
I was told in the old days of "dirty" jet engines, that the dirty jet efflux was excess kerosene, and not soot. So far so good.
It was stated often that the kerosene trail left by jets in the upper atmosphere actually REDUCED the Ozone content of the atmosphere, but I am unsure of the reasoning, whether it be absorption, chemical combination, or whatever............
Then along came the lean and clean jets with much more efficient burner cans, leaving no kerosene trail, but actually contributed to Ozone levels.
Apologies for hijacking an Ozone thread, but I've always wondered, fact or fiction?
(Note that these stories originated in the 70's, when hardly a soul had any thought for environmental concerns. The jet pollution was considered "visual" pollution).
Regards,
Old Smokey