24 January 2012

Beijing begins to disclose air pollution data

Beijing, one of the world's most heavily polluted capitals, has begun disclosing the amount of tiny pollution particles in the air in a move that could improve disclosure.


Beijing began disclosing the amount of tiny pollution particles in the air in a move that could improve disclosure but alarm a public barely resigned to the capital's choking smog.

The new measurement of particles of 2.5 micrometers or less in diameter, or PM2.5, comes after growing attention to air quality in Beijing, one of the world's most heavily polluted capitals, from Chinese as well as foreigners.

"So that the people can form a relatively complete understanding of the Beijing air quality, the Beijing Municipal Environmental Monitoring Centre will publish hourly 2.5 data from Jan. 21," the centre said on its website,

On Saturday, a clear crisp day that contrasted with the thick smog earlier in the week, the Beijing Centre reported between 0.003-0.062 mcg/m3 of PM2.5 particles in the air, Xinhua said.

"It shows that the government is responding to popular concerns about air pollution," said Steven Andrews, an environmental consultant who has studied Beijing air pollution since 2006.

"It's a recognition by the government that the way it was monitored and reported in the past didn't reflect people's perception of how serious the problem is."

Beijing pollution 'hazardous'

The data will be collected from a monitoring station in the Chegongzhuang area of the second ring road, which encircles the centre city, the Xinhua news agency said.

Chinese experts had earlier criticised as "unscientific" a single monitoring point on the roof of the US Embassy, which releases hourly air quality data via a widely followed Twitter feed.

China previously disclosed readings only of pollutant particles that are 10 micrometers in diameter or larger, although the tiny floating PM 2.5 particles can settle in the lungs more easily and cause respiratory problems and other illnesses.

Earlier in the week, the US Embassy labelled the air pollution in Beijing as hazardous after its PM2.5 reading topped its maximum reading of 500 mcg/m3.

A reading of 250 or above over a 24-hour period is hazardous, according to the US Environmental Protection Agency.

Environment Minister Zhou Shengxian said in December that China would begin nationwide collecting of PM2.5 data from 2016.

While Beijingers complain, serious soil and water pollution also plagues the rest of the country.

On Saturday, fire-fighters in the southern region of Guangxi sprayed 80 tons of aluminium chloride, a neutralising agent, into the Longjiang River after levels of the heavy metal cadmium were found to be three times the official limit, Xinhua said.

(Lucy Hornby and Wan Xu, Reuters Health, January 2012) 

Read more:

New SA system measures air quality
Why smog kills
Beijing pollution ups heart risks 


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