evidence: If Your Time is short • So-called "chemtrails" are not real, according to atmospheric chemists and geochemists. [...] Some people believe that chemtrails are a "secret, large-scale atmospheric spraying program," said a study published in 2016 by the Carnegie Institution for Science, University of California Irvine and the nonprofit organization Near Zero. [...] The U.S. Environmental Protection Agency has also debunked the chemtrails conspiracy theory. The agency says it is not aware of any deliberate release of chemicals or biological agents into the atmosphere.