The Mighty2 has a built-in AQI ( air quality index ) monitor and a MegaScan laser sensor to automatically detect three distinct air particle sizes: bacteria and microplastics; fumes, smoke, allergens, and fine dust; and dust mites, pollen, pet dander, and mold. The monitor can quantify in real time how much pollution is in the air, including large and ultrafine particles. Coway uses its own air-quality color-coding system, but the Mighty2 uses different colors from the OG Mighty model. Now the air quality light flashes blue for clean air, green for moderate, orange for unhealthy, and red for very unhealthy. Coway's color-coding system is a bit confusing, considering that it differs from the  US air quality index  standards of green for good, red for unhealthy, and purple for very unhealthy. At a glance, I was often confused by what the color was signifying about my home's air.…