Shanghai's ozone level on Tuesday was 246 micrograms per cubic metre; the WHO's limit is 100. Photo: AFP

Ozone pollution levels in Shanghai 1.5 times higher than WHO’s recommended limit

Gas now presents bigger health threat to urban residents than PM2.5 particles, but its complex formation makes it much harder to combat

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Shanghai's ozone level on Tuesday was 246 micrograms per cubic metre; the WHO's limit is 100. Photo: AFP
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