According to the Allergic Rhinitis and its Impact on Asthma (ARIA) guidelines, allergic rhinitis is classified by symptom duration (intermittent or persistent) and severity (mild or moderate-severe). Intermittent rhinitis involves symptoms for less than four days per week or four weeks, while persistent rhinitis lasts longer. Symptoms are considered mild if there is no impairment in daily activities, sleep, or school/work, and moderate-to-severe if any of these areas are impacted.