AQI_N_C空气质量指数(2)

空气质量

101 to 150 151 to 200 201 to 300 301 to 500

Orange Red Purple

Maroon

(usually not shown)

AQI Colors

These are the AQI colors. 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 Purple to Maroon, each color telling you that the air is less clean than the color before. Green is the best air quality.

GREEN YELLOW ORANGE RED PURPLE MAROON

When the AQI is green, the air is clean!

We see a lot of Yellow, Orange, and Red AQI colors in the summer when air quality often isn't at its best. Purple and Maroon are the worst air quality! Luckily we hardly ever see the AQI get to Purple. Because of people working to clean up the air, the AQI has not reached Maroon in many years! This is why Maroon is usually not shown with the AQI.

What is the AQI?

The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health.

*AQI becomes popular standard environ parameter for air quality worldwide now

Understanding the AQI

The purpose of the AQI is to help you understand what local air quality means to your health. To make it easier to understand, the AQI is divided into six categories:

Air Quality Index (AQI) Values When the AQI is in this range: 0 to 50 51 to 100 101 to 150 151 to 200 201 to 300 301 to 500

Levels of Health

Concern

Colors

...air quality conditions ...as symbolized are: by this color: Good Moderate Unhealthy for Sensitive Groups Unhealthy Very Unhealthy Hazardous

Green Yellow Orange Red Purple Maroon

Each category corresponds to a different level of health concern. The six levels of health concern and what they mean are:

z “Good” The AQI value for your community is between 0 and 50. Air quality is considered satisfactory, and

air pollution poses little or no risk.