What is AQI?

Air quality index (AQI) measures the quality of the surrounding air that describes how clean or polluted the air is. The high air pollution might have concern for the public health. AQI is usually calculated based on major air pollutants: ozone (O3), coarse particles (PM10), fine particles (PM2.5), carbon monoxide (CO), sulfur dioxide (SO2), and nitrogen dioxide (NO2). AQI status mentioned below are calculated based on PM2.5. Please visit The National Ambient Air Quality Standards for Particle Pollution for more detail.

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0 - 50 Healthy

Little to no risk.

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51 - 100 Moderate

Unusually sensitive individuals may experience respiratory symptoms.

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101 - 150 Unhealthy for Sensitive Groups

General public and sensitive individuals are at risk to experience irritation and respiratory problems.

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151 - 200 Unhealthy

Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation to heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly.

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201 - 300 Very Unhealthy

General public will be noticeably affected. Sensitive groups should not go out for activities and remain indoors.

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301 - 500 Hazardous

Everyone should avoid outdoor activities and take care to wear a pollution mask outdoors. Air purifiers should be turned on indoors.

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