One year after staging a mostly pollution-free Olympics, Beijing has seen its skies shrouded in haze again, highlighting what observers call a mixed Olympic legacy on the environment.
An air quality index published on social networking site Twitter by the US embassy has catalogued near-daily "unhealthy" readings in recent months. Just last week, as the anniversary neared, the embassy's US-standard readings spiked to "hazardous" as a familiar choking pall settled on the city. - AFP
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