In Japan, asthma mortality declined from 1950 to 2019, but halted in 1978 and continued to stall till 1996, plateauing at high levels. Notably, 1978 marked the onset of widespread pollen dispersal in Japan, suggesting increased pollen exposure may have influenced asthma severity, contributing to symptom changes, worsening, and exacerbations during this period nationwidely
Awaya A, Kuroiwa Y, Yamashita T. In Japan, asthma mortality declined from 1950 to 2019, but halted in 1978 and continued to
stall till 1996, plateauing at high levels. Notably, 1978 marked the onset of widespread pollen dispersal in Japan, suggesting increased
pollen exposure may have influenced asthma severity, contributing to symptom changes, worsening, and exacerbations during this
period nationwidely. Med Clin Sci. 2025;7(4): 58
