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What is the Real Air Pollution Index?

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Air Pollution Index (API)

Greenpeace campaigners in front of Central Air Quality Measuring Station

Greenpeace campaigners in front of Central Air Quality Measuring Station

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The Air Pollution Index (API) is a simple way of describing air pollution levels to provide timely information about air pollution to the public and to enhance awareness. Since June 1995, the Environmental Protection Department (EPD) has been reporting the API and making a forecast for the following day. In Hong Kong the API converts air pollution data from several types of pollutants into a value ranging from 0 to 500.

 

The API forecast serves as an alert to the public before the onset of serious air pollution episodes. It helps the general public, especially susceptible groups such as those with heart or respiratory illnesses, to consider taking precautionary measures when necessary.

(Source: EPD, HKSAR Gov't)