Air Quality Index Statement
Issued by NWS Knoxville/Tri Cities, TN

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6
AEUS74 KMRX 171931

Air Quality Index Forecast
National Weather Service Morristown TN
330 PM EDT Thu Jun 17 2021

This forecast is produced by the Tennessee Department Of Environment
And Conservation (

Air Quality Forecast For Friday Jun 18 2021

                                     LEVEL OF

Tri-Cities TN        Yellow          Moderate               OZ

Knoxville TN         Yellow          Moderate               OZ

GSMNP                Yellow          Moderate               OZ

Chattanooga TN       Yellow          Moderate               OZ

PM = Particulate Matter

OZ = Ozone

The six levels of health concern:

Good (Green):  Air quality is considered satisfactory, and air pollution
               poses little or no risk.

Moderate (Yellow): Air quality is acceptable, however, for some pollutants
               there may be a moderate health concern for a very small
               number of people. For example, people who are unusually
               sensitive to ozone may experience respiratory symptoms.

Unhealthy For Sensitive Groups (Orange): Members of sensitive groups may
               experience health effects. This means they are likely
               to be affected at lower levels than the general public.
               For example, people with lung disease are at greater risk
               from exposure to ozone, while people with either lung
               disease or heart disease are at greater risk from exposure
               to particle pollution. The general public is not likely to
               be affected when the AQI is in this range.

Unhealthy (Red): Members of sensitive groups may experience more serious
                 health effects.

Very Unhealthy (Purple): Everyone may experience more serious health effects.

Hazardous (Maroon): The entire population is more likely to be affected.

For more information, visit the EPA AIRNOW web site at:

$$ is the U.S. government's official web portal to all federal, state and local government web resources and services.