AUTO ADJUSTS SO YOU CAN REST EASY: One touch auto mode uses a particle sensor to monitor pollutant levels and adjusts fan to ensure optimal air quality; LED indicator displays air quality status as excellent (blue), moderate (orange) or polluted (red)CLEAN AIR IN MINUTES: Blueair’s HEPASilent dual filtration delivers up to 45% faster cleaning and up to 67% less noise than traditional HEPA filtration alone; Quickly cleans 388sqft medium room in about 12.5 min or up to 1862qft XL space in 60min, on highONE OF THE QUIETEST AIR PURIFIERS: Quieter (23 dB) than whisper on low; ENERGY STAR rated - uses less energy (3W) than an LED lightbulb on low so it’s kind to your wallet and the planetASTHMA & ALLERGY: Removes 99.99% of pollen, helping reduce allergens and pollutants that trigger allergy and asthma symptomsREMOVES ODOR & PARTICLES DOWN TO 0.1 MICRON: Ideal for smoke & smog during wildfire season; Removes 99.97% of airborne particles like smoke, dust, viruses and pet dander, while the carbon filter traps light household odors from smoking, pets and cookingMOST AWARDED AIR PURIFIER BRAND IN THE US: Blue Pure 311 Auto has won Wirecutter Pick – The Best Air Purifier 2021, 2020, 2019; The Spruce Recommends – Top PickINDEPENDENTLY TESTED FOR PERFORMANCE & SAFETY, ZERO OZONE: AHAM Verifide for CADR; Ozone Safety Standards Certified by CARB; Zero Ozone Verified (