The Dyson Pure Cool DP04 Purifying Fan features three intelligent sensors that report air quality levels on the LCD display. This includes monitoring ultrafine particles, volatile organic compounds, and nitrogen dioxide levels. In fact, the 360º HEPA filter can capture 99.97% of allergens. As a result, this purifying fan is ideal for use around people with allergies and pets. Furthermore, the activated carbon filter removes household odors to leave the room fresh and purified. So don’t mask odors with sprays—get..