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Forecast Key

The Partnership forecasts use the color-coded Air Quality Index (AQI) scale to inform people about the predicted ozone and fine particulate matter levels and any precautions that need to be taken.

What the Colors Mean to You

Color

Description

Meaning

Red

Unhealthy

Everyone should limit exertion outdoors.

Orange

Unhealthy for
Sensitive Groups

Sensitive people should limit exertion outdoors.

Yellow

Moderate

Extremely sensitive people may wish to limit outdoor exertion.

Green

Good

No health impacts are expected in this range.

WhiteNo Forecast  

Color, AQI, and Pollutant Concentrations

Color

AQI

Ozone Concentration*

PM2.5
Concentration**

Red

151-200

96-115

65.5-150.4

Orange

101-150

76-95

35.5-65.4

Yellow

51-100

60-75

15.5-35.4

Green

0-50

0-59

0-15.4

*ppb = parts per billion
**ug/m3 = micrograms per cubic meter

 

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