Dyson HEPA air filter is a good invention and helpful in the variable case. This product has multiple functions. It automatically senses air pollution events, initiates the purification, and reports the air quality levels on the LCD display.
Dyson HEPA air filter also has a WI-FI connection and you can control your machine and create a schedule around your day using the Dyson link app. Voice control using Alexa to turn on/off, turn on auto-mode, and update you on the indoor air quality. It is very helpful for asthma patients.