It's hay fever season in Japan. About one out of every six Japanese suffer from hay fever. Some sufferer wear masks or even glasses to relieve their symptoms.
According to the Wikipedia, the main cause of hay fever in the US is ragweed. On the other hand, in Japan is Japanese cedar.
Cedar pollen has been circulating earlier than usual this year because of warm winter.
I'm also a hay fever sufferer. I sometimes wear a mask when I go out. I don't want to open the window for a while.
