We reported a significant correlation between Durham’s and Burkard’s data on conifer pollen counts in 2012. In 2015 we reported that allergenic conifer pollen counts have been increasing due to a result of climate change during about 30 years. We also found Fagaceae and Ambrosiapollen count. This time, in order to try to ameliorate the suffering of those with pollinosis, we have estimated the correlation between these pollen counts and meteorological conditions.
There are nine locations monitoring airborne pollen by Durham sampler in Japan. At each location, daily airborne pollen samples were collected including holidays and sent to our hospital. We counted pollen grains per cm2 through microscope, classifying and summarizing them. From 1986 to 2014 we referred to the change in monthly mean temperature, humidity and total monthly sunlight at the close to the pollen monitoring locations. We compared their annual pollen counts with the climate data and CO2 concentration for ragweed pollen.
Fagaceae pollen counts have not shown annual fluctuation compared to conifer but have increased gradually. Only total monthly sunlight before pollination has a weak significant correlation with Fagaceae pollen (r=0.4~0.53,p<0.05). Certainly ragweed pollen counts have been increasing gradually except in a few areas. The data we found was too small to analyze and was, therefore, not statistically significant. Only in the Sendai City ragweed pollen count was there a significant correlation with CO2.
We should observe as the important allergenic causative agent not only conifers but also Fagaceae and Ambrosia pollen in Japan carefully.