Will heavy snowy weather trigger asthma?

It is possible, because asthma itself is caused by the high sensitivity of the airways. On snowy days, the cold air is a harmful stimulus, which increases the sensitivity of the respiratory tract to changes in the environment, causing the smooth muscles of the respiratory tract to contract, inducing Asthma attack.

Long-term asthma can easily cause chronic bronchitis. Please keep warm when going out in winter (wear a mask).