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The Governments of the Hong Kong Special Administrative Region and Guangdong Province have teamed up to tackle the regional air pollution problem. Here you can learn about their initiatives, including the establishment of an air quality monitoring network throughout the Pearl River Delta.

Regional Air Quality Monitoring Network

The Environmental Protection Department of the Hong Kong Special Administrative Region and Guangdong Provincial Environmental Monitoring Centre established the Pearl River Delta Regional Air Quality Monitoring Network in 2005. The Network includes 16 automatic air quality monitoring stations in the Delta. Ten stations are operated by the Environmental Protection Monitoring Centres of individual cities in Guangdong and another three are operated by the Guangdong Provincial Environmental Monitoring Centre. The remaining three are located in Hong Kong and operated by the Hong Kong Environmental Protection Department.

Goals of the Network

The Regional Air Quality Monitoring Network aims to:

  • Provide accurate data to help the two Governments appraise the air quality and pollution problems in the Pearl River Delta and devise appropriate control measures.
  • Evaluate the effectiveness of air pollution control through long-term monitoring.
  • Provide the public with information on the air quality of various places in the region.

Regional Air Quality Index

The Regional Air Quality Index (RAQI) is calculated and reported daily. It is a measure of the aggregate level of four major regional air pollutants – sulphur dioxide, nitrogen dioxide, ozone and respirable suspended particulates. The index represents the complex nature of air pollution due to transportation and interaction over the extensive area in the Pearl River Delta. The higher the index value, the higher the overall level of pollution in the region.

Tackling Regional Air Pollution

To ensure that you can breathe cleaner air, and that your children will have a better quality of life, the Governments of the Hong Kong Special Administrative Region and Guangdong Province have been involved in a number of anti-pollution initiatives. As part of the agreement that established the Regional Air Quality Monitoring Network, the two governments have worked individually various measures, including:

Hong Kong

  • Vehicle emission control, including encouragement to use pollution control devices on private vehicles and the conversion of mini-buses to liquefied petroleum gas instead of diesel fuel.
  •  Power station emission control, including the use of air-scrubbing equipment and placing emission limits on individual stations.


  • Vehicle emission control, including further tightening motor vehicle emissions and fuel standards, and recovering vapour from oil depots, tanker trucks and petrol filling stations.
  • Other emission control, including improving energy supply structure, installing flue gas desulphurisation systems in thermal power plants, and stepping up control of emissions from industrial sources.

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Last review date: August 2015

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