To relieve a runny nose caused by pollen allergies, you can use over-the-counter options. Non-drowsy oral antihistamines, such as cetirizine, loratadine, or fexofenadine, work well by blocking the allergic response. For more direct relief, steroid nasal sprays like fluticasone propionate are highly effective at reducing inflammation and stopping nasal discharge. Additionally, using a simple saline nasal spray can help flush out pollen and soothe your nasal passages. I suggest starting with a daily antihistamine or nasal spray. If your symptoms persist or if you have other health conditions, please consult a healthcare professional for personalized advice.