Contrails are human-made clouds. They are streams of condensation left behind from airplanes and rockets. Exhaust leaves water vapor that freezes into tiny crystals in the cold troposphere.

Environmental Protection Agency (EPA) Administrator Lee Zeldin said Thursday that Americans have “legitimate questions” about airplane contrails as his agency launches webpages aimed at combatting ...

ABC News chief meteorologist Ginger Zee explains the science responsible for the appearance of lines in the sky.

Lee Zeldin, the Trump-appointed head of the Environmental Protection Agency, on Thursday attempted to walk a fine line between placating conspiracy theorists and dispelling misinformation.

A 9NEWS project to make sure what you’ve heard is true, accurate, verified. Want us to verify something for you? Email [email protected] DENVER – For decades followers of the “chemtrail” conspiracy ...

A bill aimed at banning 'chemtrails' has passed the Louisiana House of Representatives, and now the bill awaits voting by the state Senate. The bill, defended by Louisiana Republican Representative ...

Treasure Coast residents awoke Monday to find a series of mysterious, milky streaks across the sky. The contrails, or condensation trails, streamed in parallel lines toward the horizon as they tapered ...