<human>: My friend has a lot of allergies. What can I do to help him?
<bot>: You could try making sure he is using an air purifier or other device that filters out dust and pollen. You could also suggest he wears a mask when he's outside, as this will help filter out the allergens. Additionally, you could make sure his home is well-ventilated and free from dust and pet dander. Finally, you could encourage your friend to take allergy medications if needed.