The purpose of the AQI is to help you understand what local air quality means to your health. Each category corresponds to a different level of health concern. For example, when the AQI for a pollutant is between 51 and 100, the health concern is Moderate. The AQI value for your community is between 0 and 50.
Air quality is considered satisfactory and air pollution poses little or no risk.
Moderate The AQI for your community is between 51 and 100. For example, people who are unusually sensitive to ozone may experience respiratory symptoms. Certain groups of people are particularly sensitive to the harmful effects of certain air pollutants. This means they are likely to be affected at lower levels than the general public. For example, children and adults who are active outdoors and people with respiratory disease are at greater risk from exposure to ozone, while people with heart disease are at greater risk from carbon monoxide.