China’s Environment Ministry on Dec. 30 approved new air- quality standards to include pollutants smaller than 2.5 micrometers in diameter, known as PM2.5, the newspaper said, without giving a date when Beijing will begin monitoring.
The government currently uses an indicator known as PM10 that measures particulates as big as 10 micrometers in diameter for its public pollution data. Air quality in all of the 32 Chinese cities that track pollution fall short of World Health Organization guidelines. The air in Beijing is the fifth-worst in China, based on the PM10 measure. The U.S. embassy in Beijing monitors PM2.5, and releases the information via Twitter.
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