also: すぎかふん
noun
cedar pollen
Specifically refers to pollen from the Japanese cedar (Cryptomeria japonica), a major cause of seasonal allergies in Japan.
今年はスギ花粉の飛散量が多いらしい。
It seems the amount of cedar pollen in the air is high this year.
スギ花粉症の人は春がつらい。
People with cedar pollen allergies have a hard time in spring.
花粉症 is hay fever or pollen allergy in general, while スギ花粉 specifically refers to the cedar pollen itself.
Compound of 杉 (すぎ, cedar) and 花粉 (かふん, pollen). The katakana spelling スギ for the tree is common in this compound.