Your Child's Asthma: Avoiding Triggers How to avoid asthma triggers Many things can trigger an asthma flare-up, including the following: Upper respiratory infections, like colds or the flu Allergies to dust mites, pollens, pets, mold, or cockroaches Exercise Irritants, such as cigarette and other forms of smoke, strong odors and perfumes, fumes from wood stoves or kerosene heaters, and air pollution Weather changes The following is a list of things you can do to limit your child's exposure to common tri...