According to allergist Dr. Juan Kothny Pommer, “in industrialized countries hay fever affects as much as 20 percent of the population, being more frequent in the cities. ”
Šīs cietās daļiņas nokļūst gaisā un, domājams, veicina alergēnu — vielu, kas izraisa alerģisku reakciju, — iedarbību uz cilvēka organismu.