AirDoctor sells an expensive purifier with a filter that it marketplaces as “UltraHEPA,” boasting that the filter traps particles one hundred instances smaller than what HEPA filters can seize. It excels in air-quality emergencies, like wildfires. In 2017, we created wildfire ailments within our La Workplace and analyzed many purifiers. https://johnf418utq5.ourcodeblog.com/profile