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AQI values below are generally thought of as satisfactory. When AQI values are above , air quality is considered to be unhealthy at first for certain. Background Information: The Environmental Protection Agency (EPA) measures pollution in the air. Then they use the Air Quality Index, or AQI, to tell. Each day the AQI is one of these colors. The colors tell you how healthy the air is to breathe that day. The colors go from Green to Yellow to Orange to Red to.

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Air Quality Index Scale and Color Legend ; 0 - 50, Good, Air quality is considered satisfactory, and air pollution poses little or no risk ; 51 , Moderate. The AQI is divided into color-coded categories, and each category is identified by a simple informative descriptor. The descriptors are intended to convey. An air quality index (AQI) is used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to.

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Various colors are used to communicate air pollution concentrations and they don't always mean the same thing. Here is what our colors mean and why, as well as. An air quality index (AQI) is used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to. Higher AQI values also mean greater concern for people's health. For example, an AQI value of 50 in the “green” range represents good air quality with little.