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But a glimpse from another monitoring station that gives hourly updates shows a very different picture. The U.S. Embassy operates a single station in eastern Beijing that records levels of PM2.5, fine particles considered particularly dangerous to human health. At noon that same day, the hourly measure of PM2.5 crept...
The embassy data is published on its own Twitter feed, and while the U.S. doesn't actively promote the information, it has slowly been getting more attention from Beijing residents concerned about the city's air quality. "The U.S. Embassy has an air quality monitor to measure PM 2.5 particulates...
Reporting from one area, the twitter feed is hardly a complete service, but its popularity underscores some shortcomings in the official daily reports. Chinese environmental officials don't regularly release PM2.5 data, and it isn't used to calculate the daily air pollution index. Instead the government figures rely on...
Ahead of the Beijing Olympics last year environmental officials came under harsh criticism that they were tweaking pollution data to artificially raise the number of so-called "blue sky" days when emissions fall below official targets. American environmental consultant Steven Q. Andrews accused the government of switching to monitoring stations...
In the past year, the proportion of days just under the "blue sky" cutoff has decreased in Beijing. Whether that's a sign that the numbers are more accurate, or merely better gamed, is still unclear. The city's hot, humid summers and occasional sandstorms mean that air quality can...