Smoke can also trigger asthma attacks in many children and they are often worse than in children who aren't exposed to someone who smokes. (verywellfamily.com)
Ammonia emanating from a litter box can also trigger an asthma attack in both pets and people. (petage.com)
However, in people with asthma, the M2 cells and the chemical signals they emit linger and call in other cells that cause inflammation that can trigger an asthma attack with the classic symptoms of difficulty breathing, wheezing and shortness of breath. (sciencedaily.com)