It would be expected that prevalence and severity will decrease when one considers the projected number of Japanese cedar trees that will be felled by the forestry industry and meteorological effects such as global warming, but it is believed that the airborne pollen levels will actually continue to rise.
林業におけるスギ伐採量の見通しや地球温暖化など気象の影響を考慮すると、ゆるやかではあるが今後も花粉の飛散量は増え続けると考えられている。