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 ...

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 ...