Conclusion
NPI during the COVID-19 pandemic is a risk factor for indoor and outdoor allergen sensitization. It was also found that allergen gradeĀ of dust mite and rates of multiple sensitizations were significantly higher than those before the COVID-19. To reduce indoor allergen concentrations, we recommend: (1) Use a dehumidifier, vacuum, air purification, mite removal instrument, and open windows frequently for ventilation. (2) No use of carpets and fabric curtains, and regularly wash and replace mattresses and pillows. (3) Avoid keeping pets. (4) Avoid going out during pollen season. Wear a mask when going out, and change masks on time. (5) Avoid allergens based on their age and seasonal characteristics.