AIR POLLUTION IN BEIJING

BEIJING RELEASES KEY DATA EXPECTED TO INDICATE EXTENT OF ITS AIR POLLUTION

Associated Press

The Washington Post, January 21, 2012

BEIJING — Caving to public pressure, Beijing environmental authorities started releasing more detailed air quality data Saturday that may better reflect how bad the Chinese capital’s air pollution is.
The initial measurements were low on a day where you could see blue sky. After a week of smothering smog, the skies over the city were being cleared by a north wind.

The readings of PM2.5 — particulate matter less than 2.5 micrometers in size or about 1/30th the average width of a human hair — were being posted on Beijing’s environmental monitoring center’s website. Such small particulates can penetrate deep into the lungs, so measuring them is considered a more accurate reflection of air quality than other methods.

It is the first time Beijing has publicly revealed PM2.5 data and follows a clamor of calls by citizens on social networking sites tired of breathing in gray and yellow air. The U.S. Embassy measures PM2.5 from a device on its rooftop and releases the results, and some residents have even tested the air around their neighborhoods and posted the results online.

Beijing is releasing hourly readings of PM2.5 that are taken from one monitoring site about 4 miles (7 kilometers) west of Tiananmen Square, the monitoring center’s website said Saturday. It said the data was for research purposes and the public should only use it as a reference.

The reading at noon Saturday was 0.015 mg/m3, which would be classed as “good” for a 24-hour exposure at that level, according to U.S. Environmental Protection Agency standards. The U.S. Embassy reading taken from its site on the eastern edge of downtown Beijing said its noon reading was “moderate.” Its readings are posted on Twitter.

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