I have suffered from asthma for many years and recently experienced increased coughing on days with polluted air, fine dust, and smoke. Can environmental factors worsen the condition? (Tran Mai, Hanoi)

I am allergic to cockroaches. Can this condition lead to severe respiratory problems, trigger or worsen asthma? (Thai Hung, Hanoi)

My child suffers from asthma and sinusitis, and has had a stuffy nose, difficulty breathing, and poor sleep for several days. Can prolonged air pollution make these conditions more severe? (Thoa Kim, 38, Hanoi)

A 65-year-old patient asks why asthma and chronic obstructive pulmonary disease (COPD) flare up with air pollution and what preventive measures can be taken.