Thanks for your question in HCM.
I can understand your concern
Asthma effects 5 to 8 % of population.
Symptom can be precipitated by 1.
cold air, 2.allergens like house dust mite, pollen, fur etc 3..infection,4. smoking and
passive smoking, 5.pollution 6.Even by some drugs like , NSAIDs , beta- blockers..
Symptoms may also increase in 7.early morning and 8. in contact with pets/carpets/feather pillows/ duvet/ floor cushions and other soft furnishings..
So you should avoid such precipitant factor as much as possible.
Hope I have solved your query.
Wish you good health thanks.
Thanks.