People refused to venture outdoors and buildings disappeared into Beijing’s murky skyline yesterday as the capital’s air quality went off the index.
The Beijing Municipal Environmental Monitoring Center said on its Web site that the density of PM2.5 particulates had surpassed 700 micrograms per cubic meter in many parts of the city. The WHO 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.
Photo: AFP
The Beijing center recommended that children and the elderly should stay indoors, and others should avoid outdoor activities.
The US embassy also publishes data for PM2.5 on Twitter, and interprets the data according to more stringent standards.
In the 24-hour period up to 10 am yesterday, 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 US’ Environmental Protection Agency’s air quality index only goes up to 500 and it advises 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, streets were still fairly busy and there was the familiar sight of lines of 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 only ventured out because he needed to go shopping.
PM2.5 can result from the burning of fuels in vehicles and power plants.
Weather conditions are a factor in the recent poor air quality as a lack of wind means pollutants can easily accumulate and fail to dissipate, said Pan Xiao Chuan (潘小川), a professor at Peking University’s public health department.
“Recent pollution doesn’t mean there is an increase in the discharge of pollutants,” he said.
Experts say they thought the PM2.5 readings were the highest since Beijing started publishing that data early last year.
Public pressure forced the publication of the more detailed air quality data, as a growing Chinese middle class is increasingly vocal about the quality of the environment in which it lives. Now hourly air quality updates are available online for more than 70 cities.
Air pollution is a major problem in China due to the country’s rapid pace of industrialization, reliance on coal power, explosive growth in car ownership and disregard to environmental laws. It typically gets worse in the winter because of heating needs.
Beijing’s air started to worsen on Thursday. The Beijing monitoring center has said the pollution is expected to linger until tomorrow.
Several other cities, including Tianjin on the coast east of Beijing and southern China’s Wuhan City, also reported severe pollution over the last several days.
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