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Published online 17 June 2009 | Nature | doi:10.1038/news.2009.578
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Beijing's clean air claims questioned
Environment ministry now plans to monitor ozone and small particles.
Beijing spent the run-up to last year's Olympic Games claiming that the city's air had been drastically cleaned up, but those measurements are now being called into question.
Using an air pollution index (API) in which a score of 100 or lower indicates air quality as 'good', all 17 days of Olympic events in Beijing made the grade.
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