空氣污染指數.....急!!

The Air Pollution Index is to let you know about the quality of the air at the moment.
The API converts air pollution data from several types of pollutants into a value ranging from 0 to 500. Those pollutants are nitrogen dioxide, sulphur dioxide, ozone, carbon monoxide and respirable suspended particulates. APIs for each of these five pollutants are calculated and the highest API number is reported as the API of that hour.
API and Air Quality
The API ranges from 0 to 500 and is divided into 5 bands according to the potential effects on health. The potential health effects for different ranges of API values are as follows.




Air Pollution Index
Air Pollution Level
Health Implications

0 - 25
Low
None expected.

26 - 50
Medium
None expected for the general population.

51 - 100
High
Very few people, if any, may notice immediate health effects. Long-term effects may, however, be observed if you are exposed to such levels for a long time.

101 - 200
Very High
People with existing heart or respiratory illnesses will notice mild aggravation of their health conditions. Generally healthy individuals may also notice some discomfort.

201 - 500
Severe
People with existing heart or respiratory illnesses will experience significant aggravation of their symptoms and there will be also widespread symptoms in the healthy population. These include eye irritation, wheezing, coughing, phlegm and sore throat.
Points to Note
The suggested precautionary actions are summarised below.




Air Pollution Index
Air Pollution Level
Precautions

0 - 25
Low
No response action is required.

26 - 50
Medium
No response action is required.

51 - 100
High
No immediate response action is suggested - long-term effects may, however, be observed if exposed at this level persistently for months or years.

101 - 200
Very High
Persons with existing heart or respiratory illnesses (such as coronary heart and cardiovascular diseases, asthma, chronic bronchitis and chronic obstructive airways diseases) are advised to reduce physical exertion and outdoor activities.

201 - 500
Severe
The general public are advised to reduce physical exertion and outdoor activities.
As the health effects on individuals may vary, you should seek advice from a medical doctor if you are in doubt or feel uncomfortable.