Aqi level chart

Think of the AQI as a yardstick that runs from to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of represents good air quality with little potential to affect public health, while an AQI value over 3represents hazardous air quality. The AQI value for your community is between and 50. Air quality is satisfactory and poses little or no health risk.

In other words “code re means the same thing in Los Angeles as it does in Raleigh, NC or Washington, D. Each color corresponds to a different level of health concern. This is only relevant for cities in Asia, like Japan and Taiwan. Ground- level ozone is one of our nation’s most common air pollutants. Use the chart below to help reduce your exposure and protect your health.

Air Quality Guide for Ozone. People are no longer exposed to any health risk because the quality of air is pure. This tool plots daily AQI values for a specific location and time period.

Each square or “tile” represents one day of the year and is color-coded based on the AQI level for that day. The legend tallies the number of days in each AQI category. Levels Are In their City or Country? EPA and local officials use the AQI to provide you with simple information on local air quality, the health concerns for different levels of air pollution, and how you can protect your health when pollutants reach unhealthy levels. Good When the AQI level ( air quality index ) is below 5 people are breathing fresh, clean air.

EPA sets national air quality standards for six common air pollutants. Each year EPA tracks the levels of these air pollutants in the air. EPA posts the of our analyses to this web site. An AQI under means that the air quality is good. At this low AQI level , a person can spend time outdoors and air pollution will pose very little risk to their health.

As the AQI number increases, so does the risk to human health. See the chart below for a summary of the AQI levels of health concern. Environmental Protection Agency, the AQI looks for five major air pollutants regulated by the Clean Air Act: particle pollution, ground- level ozone, carbon monoxide, nitrogen dioxide, and sulfur dioxide.

When you look at the AQI at your nearest monitoring site or in you region, you will see the display of a colour depending on the air quality measured. Some people may be more sensitive to air pollution. This site provides air quality data collected at outdoor monitors across the United States, Puerto Rico, and the U. Users can downloa output, view or visualize the data. See AQI Table for how to interpret the colors.

The Index numbers represent a ranking for the pollutant, not the measurement of a pollutant. How does the AQI work? Health Effects Statement PM2.

Unusually sensitive people should consider limiting prolonged outdoor exertion. All data are reported in Mountain Standard Time (MST). Unhealthy for Sensitive Groups. During daylight savings time add one hour to the reported hour.

Based on several studies at both low and high pollution levels , the human health effects are believed to be.