What types of air purifiers are available?

Oct 13, 2017 ... Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the "Hazardous category." See additional information on ... an online, color-coded index created by the US Environmental Protection Agency (EPA) that communicates whether the relative air quality and air pollution level ... AQI is calculated based on common air pollutants including particulate matter ... air quality at times. AQI. Hazardous (301-500). Very Unhealthy (201-300) ... The Air Quality Index (AQI) is a national index for reporting forecasted and daily air quality. It explains how clean or polluted the air is, and highlights ... Outdoor Air Quality Health Recommendations Based on Air Quality Index. AQI. Level. General Public. 0 to 50. Good. A great day to be active outside. 51 to 100 ... The AQI uses colors and corresponding numbers to communicate the current air quality for air pollutants regulated by the Clean Air Act. To protect public health ... Apr 24, 2025 ... How do the numbers work? The index's scale runs from 0 to 500; the higher the number, the worse the air. If the index is registering less than ... Sep 27, 2023 ... How do I read the AQI? The scale is split into six categories, each with a color and a number corresponding to the amount of pollution in the ... Sep 22, 2022 ... The greater the density of pollutants in the air, the higher the Air Quality Index (AQI), a scale that runs from zero to 500. An AQI of 50 ... Nov 20, 2024 ... The AQI is an index for reporting daily air quality. It tells how clean or polluted the air is, and what associated health effects might be a ...