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An ozone (O 3 ) episode that occurred in Hong Kong during 18–22 August 1999 was investigated. This episode lasted nearly 2 days with Typhoon Sam located at 500km away from Hong Kong in the southeast. The maximum ground-level concentration of O 3 reached 334μgm −3 , which violated the Hong Kong Air Quality Objective for O 3 (240μgm −3 , 1h). The visibility was...
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