Beijing Raises Smog Alert as Airport Cancels 227 Departures

  • Central city PM2.5 concentration was 503 micrograms at 2 p.m.
  • Officials issued orange alert, second-highest of four levels

Beijing issued an alert for severe air pollution Friday, warning children and the elderly to avoid outdoor activities as limited visibility from the thick smog forced the airport to cancel 227 departures.

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