Air pollutants form the condensation nuclei for ice clouds or cirrus clouds (here: Cirrus spissatus). When ammonia, nitric acid and sulfuric acid are present together, they form such condensation ...

Cirrus clouds exist at much higher altitudes (usually above 18,000 feet or so) and much colder temperatures. They are typically composed of tiny ice crystals instead of water droplets and often ...

"Cirrus clouds are the highest of the main cloud types, usually made up of patches or bands of ice crystals." Francesca Bregdan knew it was unusual when she took this picture on October 7, 2020.

image: Air pollutants form the condensation nuclei for ice clouds or cirrus clouds (here: Cirrus spissatus). When ammonia, nitric acid and sulfuric acid are present together, they form such ...