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According to the data from Guangdong-Hong Kong-Macao Regional Air Quality Monitoring Information System, from 2006 to 2014, the average Ozone level in Guangdong was 57 µg/m3 ; while Hong Kong side (three stations: Tap Mun, Tsuen Wan and Tung Chung) recorded 56 µg/m3 over the same period. However, when looking at the increase rate from 2006 to 2014, we found that the average level of Ozone in all general monitoring stations in Hong Kong had increased by 27.2%, compared to the Guangdong side’s ratio of 19.5% over the same period. In other words, Hong Kong has a much higher increase rate of Ozone level. And if we look at the data from 2010 to 2014, the increase rate for Hong Kong was 17.1% and Guangdong, 6.1%. This means regional ozone could not account for all ozone increase in Hong Kong. Clean Air Network therefore urges the government to tackle the issue both locally and regionally. Hong Kong government can make use of the current platforms to strengthen cross-border cooperation and set up emission reduction targets for Ozone.
Clean Air Network is an independent NGO that educates the Hong Kong public on the impact of air pollution. It is the city's principal voice and network working to enable positive change in air quality policies.