The Air Quality Index, or AQI, is the system used to warn the public when air pollution is dangerous. The AQI tracks ozone (smog) and particle pollution (tiny particles from smoke, power plants and factories, vehicle exhaust, and other sources), …

The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of …

Feb 25, 2022 · What Does Air Quality Mean and What Is Unhealthy Air Quality? Every day, the EPA issues AQI numbers for areas all around the country. This number tells you if your air quality is good, moderate, unhealthy, or bad. AQI numbers start at 0 and can go up to 500. The higher the number, the worse the air pollution.

Aug 4, 2018 · The index represents air pollutant concentrations with a number falling within a range of air quality categories. Within each category and number range, elevated health risks associated with rising air pollutant concentrations are identified.

Sep 23, 2021 · The Air Quality Index can help you decide when the air quality is good or dangerous. The scale ranges from 0 to 500 and has six color-coded categories to correspond to a different level of health concern, according to AirNow.gov.

The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.

May 29, 2024 · What are considered good and bad AQI values? An AQI value under 50 is considered good air quality, meaning that it is safe for everyone to spend time outdoors without posing a risk to their health. As the AQI number increases however, so does the risk to health. An AQI over 300 is considered hazardous.

When AQI values are above 100, air quality is considered to be unhealthy—at first for certain sensitive groups of people, then for everyone as AQI values increase. What do the AQI values mean? The purpose of the AQI is to help you understand what …

Every day the Air Quality Index (AQI) tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern. Local air quality affects how you live and breathe. Like the weather, it can change from day to day or even hour to hour.

"Good" (0 - 50) Air quality is excellent and poses little or no risk. "Moderate" (51 - 100) Air quality is acceptable; however, there may be some health concern for a small number of unusually sensitive individuals.