Mohammad Nassar is a 15-year-old male complaining of increased difficulty breathing over the last two days. From his chart, you see that Mohammad has a history of asthma and is on a maintenance dose of albuterol 4 mg extended-release tablets twice a day. Dr. Williams has ordered a peak expiratory flow test and has referred Mohammad for allergy testing. Why did the doctor refer Mohammad for allergy testing? In addition to the prescribed medication, what can Mohammad do to help reduce his symptoms?