A 2011 study had shown that ambient fungal spores play a huge part in children visiting the hospital emergency room.

The researchers studied the association between daily emergency department visits for asthma to a children’s hospital, and daily concentrations of both pollen grains and fungal spores during a 5-yr period between 1993 and 1997.

They discovered fungal spores, but not pollen grains, were associated with a significant proportion of the asthma exacerbations in children that prompt an emergency department visit.(2)

Source: Influence of ambient fungal spores on emergency visits for asthma to a regional children’s hospital