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The fourth round of heavy smog to hit Beijing in four weeks has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The latest round of murky haze, described by many native Beijingers as the "worst fog ever," began to choke the Chinese capital on Monday and worsened on Tuesday, reducing visibility to under 500 meters in many parts of the city proper. [Source: China Daily]
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