Maybe lack of vitamin D as kids are spending more time inside and also using sunscreen when they are outside.
My daughter’s asthma escalated a ton when she was put on anti-seizure medication that strips out vitamin D.
Her twin sister has always had bad asthma, and I have it. However, my daughter with seizures had never really had a problem with it until she had been on seizure medication for a year. Of course that was also last year. She moved to a larger middle school, and we had H1N1 going around. Last year was a very tough year. It seemed like she was constantly sick. As soon as she would get off anti-biotics she would pick up another cold and it would go straight to her lungs. She spent from November-May only being well when she was on anti-biotics.
So far this year, she has not been on anti-biotics once. She’s on a lower dose of seizure medication, and we’ve upped her vitamin D supplements.
I believe there is something to that. My son used to get one to two attacks a week during the winter. I started him on vitamin D two winters ago, and he had not had an attack since.