Can clouds be formed without a pollen particle's role?
Pollen is one of many types of cloud condensation nuclei (CCN). So can you make clouds without pollen? Yes, but you still need other sources of CC. Don’t fall into the false dilemma that pollen is a requirement for cloud formation. The more soluble the CCN is, the easier it is to form a cloud (see Koehler theory).
Can a cloud be formed without CCN? I saw it once calculated that it would take longer than the age of the universe for something like that to occur.