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How is the air quality code system defined?

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How is the air quality code system defined?

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The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health concerns you should be aware of. The AQI focuses on health effects that can happen within a few hours or days after breathing polluted air. EPA uses the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect against harmful health. GREEN 0 – 50 Good YELLOW 51 – 100 Moderate ORANGE 101 – 150 Unhealthy for Sensitive Groups RED 151 – 200 Unhealthy PURPLE 201 – 300 Very Unhealthy MAROON 301-500 Hazardous “Unhealthy for Sensitive Groups” When AQI values are between 101 and 150, 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 r

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