Abstract
Meteorologists are accustomed to the atmospheric phase changes of water. It is observed that phase changes ending with crystallization and crystal growth of (NH 4) 2SO 4 take place in Andersen Samplers used to collect size-stratified samples of airborne particles. It is not at this point clear whether preformed (NH 4) 2SO 4 crystals of small size are involved, although this is likely, but the cascade impaction processes evidently play a rôle in generating large (NH 4) 2SO 4 crystals on the last few stages of these samplers.
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