Actually, according to an investigation in which both the components of the kosa captured in China and those in Tsukuba City, Ibaragi Prefecture in Japan, were analyzed, the kosa in Tsukuba City included more nitrogen dioxide (NO2) and hydrogen sulfate (HSO4), supporting the relationship described above.
実際、中国と日本の茨城県つくば市でそれぞれ採取された黄砂の成分調査によると、つくば市のものは二酸化窒素(NO2)や硫酸水素(HSO4)が増加しており、これを裏付けている。