Beijing air pollution off the charts

A woman wearing a mask crosses a road during severe pollution in Beijing on January 12, 2013. Air quality data released via the U.S. Embassy Twitter feed recorded air quality index levels so hazardous that they were classed as "Beyond Index." Ed Jones/AFP/Getty Images

BEIJING People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the air quality in China's notoriously polluted capital went off the index.

The Beijing Municipal Environmental Monitoring Center said on its website that the density of PM2.5 particulates had surpassed 700 micrograms per cubic meter in many parts of the city. The World Health Organization considers a safe daily level to be 25 micrograms per cubic meter.

PM2.5 are tiny particulate matter less than 2.5 micrometers in size, or about 1/30th the average width of a human hair. They can penetrate deep into the lungs, so measuring them is considered a more accurate reflection of air quality than other methods.

The Beijing center recommended that children and the elderly stay indoors, and that others avoid outdoor activities.

The U.S. Embassy also publishes data for PM2.5 on Twitter, and interprets the data according to more stringent standards.

A child on a bicycle is pushed by a woman on a stone arch bridge in heavy smog in Beijing, China, January 13, 2013.
Chen Yujie/AP Photo

In the 24-hour period up to 10 a.m. Sunday, it said 18 of the hourly readings were "beyond index." The highest number was 755, which corresponded to a PM2.5 density of 886 micrograms per cubic meter. The U.S. Environmental Protection Agency's air quality index goes up to only 500, and the agency advises that anything greater than 300 would trigger a health warning of "emergency conditions," with the entire population likely affected.

While some people vowed to stay indoors with air purifiers turned on, Beijing's streets were still fairly busy Sunday, and there was the familiar sight of heavy traffic on main thoroughfares.

A young couple strolled along hand in hand in the central business district, both with matching white masks strung around their faces. Two Taiwanese tourists wore masks they said they had brought with them because they heard Beijing's pollution was so bad.

"I don't know why there is such heavy haze these past days. It's really quite serious compared with the air quality three days ago," said a 33-year-old lawyer, who would give only his surname, Liu, as he adjusted his own mask. He said he had ventured out only because he needed to go shopping.

Beijing's air started to worsen on Thursday. The Beijing monitoring center has said the pollution is expected to linger until Tuesday.

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