If you are living in Tokyo and you have pollen allergy, you too will wear masks all day.
I honestly don't know if I've had a day without an allergic reaction in the last decade (the time I've been in Austin). My sinuses are a complete mess and I have to eat low inflammatory diets, give myself allergy injections, pop sudafed, etc.
I was born in Japan and am living in Tokyo for 6 years. I have no pollen allergy for now fortunately.
> Then, in the 1950s, Japan’s rapid post-World War II industrialization led to rampant air pollution and booming growth of the pollen-rich Japanese cedar, which flourished due to rising ambient levels of carbon dioxide. Mask-wearing went from seasonal affectation to year-round habit.