Fine powder produced by plants (pollen), released from stamens etc.; often airborne seasonally and can cause allergies.
春になると花粉が飛び始める。
In spring pollen begins to be airborne.
花粉で目がかゆくなった。
My eyes became itchy because of pollen.
花粉を防ぐためにマスクをする人が多い。
Many people wear masks to protect against pollen.