The issues on air quality as a result of haze or wildfire smoke may underline the importance of having HEPA purifiers in a room, particularly if the purifiers have the optimal specifications for power and area coverage. The machines can work in case certain rooms do not have the proper links to the heating, ventilation, and air conditioning system. The Messenger-Index staff does not recommend outdoor activities when the air quality is at critical levels. However, pressing matters can prompt people to don a sturdy HEPA filter maskâ¤“ and even then, they stay outside for short periods to prevent sheer saturation of the apparatus. A seller such as the Allergy Relief Store carries masks that are washable and reusable.