Beijing smog drops to acceptable levels

Traffic on the second ring road as heavy air pollution continues to shroud Beijing on February 26, 2014. Beijing's official reading for PM 2.5, small airborne particles which easily penetrate the lungs and have been linked to hundreds of thousands of premature deaths, stood at 501 micrograms per cubic metre. AFP PHOTO/Mark RALSTONMARK RALSTON/AFP/Getty Images
Traffic on the second ring road as heavy air pollution continues to shroud Beijing on February 26, 2014. Beijing's official reading for PM 2.5, small airborne particles which easily penetrate the lungs and have been linked to hundreds of thousands of premature deaths, stood at 501 micrograms per cubic metre. AFP PHOTO/Mark RALSTONMARK RALSTON/AFP/Getty Images

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    Beijing smog drops to acceptable levels

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