AQI value and impact on health

Air Quality Index
(AQI)
0~50 51~100 101~150 151~200 201~300 300~500
Impact
on Health
Good Moderate Unhealthy for Sensitive Groups Unhealthy Very Unhealthy Hazardous
Status Color            
Impact on Human Health Air quality is considered satisfactory, and air pollution poses little or no risk. Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. Members of sensitive groups may experience health effects. The general public is not likely to be affected. Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. Health alert: everyone may experience more serious health effects. Health warnings of emergency conditions. The entire population is more likely to be affected.

Air Quality Index and Activity Guidance

Air Quality Index
(AQI)
0~50 51~100 101~150 151~200 201~300 301~500
Air Quality Index Levels
of Health Concern
Good Moderate Unhealthy for Sensitive Groups Unhealthy Very Unhealthy Hazardous
Status Color Green Yellow Orange Red Purple Maroon
Activity Guidance
for the
General Public
Enjoy your usual outdoor activities. Enjoy your usual outdoor activities. 1.Everyone experiencing discomfort such as sore eyes, cough or sore throat should consider reducing outdoor activities.
2.For students, it’s ok to be active outside, but are recommended to reduce prolonged strenuous exercise.
1.Everyone experiencing discomfort such as sore eyes, cough or sore throat should reduce physical exertion, particularly outdoors.
2.Students should avoid prolonged strenuous exercise, and take more breaks during outdoor activities.
1.Everyone should reduce outdoor activities.
2.Students should stop outdoor activities and move all activities and classes indoors.
1.Everyone should avoid outdoor activities and keep doors and windows closed. If it is necessary to go out, please wear a mask.
2.Students should stop outdoor activities and move all activities and classes indoors.
Activity Guidance
 for Sensitive Groups
Enjoy your usual outdoor activities. Unusually sensitive groups are recommended to watch for symptoms such as coughing or shortness of breath, but can still be active outside.
 
1.People with heart, respiratory and cardiovascular problems, children, teenagers and older adults are recommended to reduce physical exertion and outdoor activities.
2.People with asthma may need to use their reliever inhalers more often.
1.People with heart, respiratory and cardiovascular problems, children, teenagers and older adults are recommended to stay indoors and reduce physical exertion. If it is necessary to go out, please wear a mask.
2.People with asthma may need to use their reliever inhalers more often.
1.People with heart, respiratory and cardiovascular problems, children, teenagers and older adults should stay indoors and reduce physical exertion. If it is necessary to go out, please wear a mask.
2.People with asthma should use their reliever inhalers more often.
1.People with heart, respiratory and cardiovascular problems, children, teenagers and older adults should stay indoors and avoid physical exertion. If it is necessary to go out, please wear a mask.
2.People with asthma should use their reliever inhalers more often.