Desolation of smog: Tackling China's air quality crisis

 
Smog in Shanghai's financial district of Pudong All downhill from here? China wants to arrest the decline in air quality in urban centres

Officials in China say they are confident green technology will help overcome the country's notoriously polluted air.

Apocalyptic scenes of dense smog have recently forced major cities including Shanghai and Harbin to virtually shut down.

The capital Beijing is among urban areas where pollution routinely exceeds safety limits set by the World Health Organization (WHO).

In a rare interview, a senior environmental official told the BBC he was "optimistic" that the problems would be overcome.

How China is trying to battle the smog

The Chinese government has launched an effort worth 1.7 trillion yuan (£180bn) to clean up power stations and traffic fumes.

The head of air quality at Beijing's Environmental Protection Bureau, Wang Bin, pointed to the success other major world cities have had in tackling smog.

"You can see in those big cities like in London in Britain, Los Angeles in America and Tokyo in Japan, they all had huge air problems in the past - for example, London was nicknamed Smog City - which was caused by fast industrialisation.

Air quality monitoring equipment Pollution monitoring equipment is an outward sign that China is taking air quality seriously

"But their situation has improved a lot and their air is really better now. Beijing's pollution is not that severe.

"We have already moved fast to cope with this issue. So we are very confident about reaching a good level of air quality and changing our capital into a green Beijing in future."

Specific measures include closing down any power stations within the city that burn coal - or switching them to burning cleaner gas instead.

A new lottery system with very few winners is restricting the rise in the number of new cars and drivers. Beijing already has five million cars on its roads, and greener cars will get priority.

Beyond that, a major push for renewable energy including hydroelectric, wind and solar is designed, in part, to help replace power generation by coal, the cheapest but most polluting fuel.

But many people will remain to be convinced that these actions are drastic enough - or that any official optimism is justified.

One mother, Jia Yi, told me of her fears for the health of her twin seven-year-old daughters.

She insists that Ji Xiang and Ru Yi wear face masks on days when the pollution levels are high.

"There are so many people and cars in Beijing and that will influence my children's health - I do believe Beijing is not a place to live.

"So if it won't affect my children's education, we'd rather go to the southern part of China which has better air and environment."

Ji Xiang and Ru Yi Twins Ji Xiang and Ru Yi wear face masks on days when pollution levels are high

Prof Pan Xiao-chuan of Peking University's School of Public Health has led studies into air pollution.

"My personal feeling is that in the last two years the smog frequency in Beijing has been rising - we have figures to prove that - and also the density of the smog is increasing.

"This means the figures of PM 2.5 and PM 10 are really high when there's a big smog in Beijing."

PM 2.5 and PM 10 are two types of pollution involving particles too small to see with the naked eye - less than 2.5 or 10 microns in diameter.

Often these consist of fragments of unburned fuel and are small enough to reach the lungs or, in the smallest cases, to cross into the bloodstream as well.

The World Health Organization (WHO) sets a maximum safe limit of exposure over a 24-hour period: 25 of the PM 2.5 particles in every cubic metre of air.

Infographic

Most Chinese cities routinely experience levels well in excess of 200 and, on one occasion in Beijing, of 800.

Given the risks of respiratory and cardiovascular problems, Prof Pan says the regular publication of pollution data has "a very important public health value".

Until recently, the Chinese authorities did not release data on PM2.5, even though readings on this pollution type were published by the US Embassy in Beijing.

This led to an outcry on social media during a particularly bad smog event in 2011 and forced a change in policy.

Prof Pan said: "This will warn the public when they can go outdoors and when it's better to stay indoors, and how the old and children should protect themselves."

The threat of air pollution has become so serious that one school for expatriate children has taken the drastic step of sealing off part of its playground.

Monitoring centre A social media outcry led to changes on the publication of pollution data

A giant inflatable dome at the International School of Beijing now provides an insulated space where the air is filtered and positive pressure ensures any pollution is kept at bay.

Gerrick Monroe, the school's operations director, said the dome was bought after one pollution spell kept children indoors for a 20-day period.

"One of the first questions prospective parents will ask is 'what is the air quality like?'

"This is one of the selling points - we take indoor air quality very seriously here."

For the longer term, the hope is that the government's measures will start to take effect.

But one leading environmental scientist, Prof Zhang Shiqui of Peking University, says it is "a really big challenge for China" trying to balance economic growth and poverty reduction with public health.

Buildings are shrouded in smog in Lianyungang, China Some commentators are less than optimistic about the prospects for a greener environment in the near term

"I think it's highly dependent on whether China can successfully introduce a restructuring strategy and, second, can China can switch to cleaner sources of energy, and can consumers change their behaviours?

"In previous years, if the government wanted to slow down the economy to get a greener environment, the public would not have agreed.

"But after the PM2.5 event in 2011, the public has a high awareness of air pollution and they are eager to improve the environment here.

"But although China has huge GDP growth, per capita it's still very low, so China should maintain proper economic growth to solve the poverty issue."

The reality is that it will take years or even decades to reduce China's pollution problem - but a combination of public awareness and cleaner technology may help accelerate the process.

 
David Shukman Article written by David Shukman David Shukman Science editor

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  • rate this
    +2

    Comment number 137.

    One way to reduce smog and increase energy security simultaneously would be to have a flex fuel bill that mandated all new petrol cars have the ability to burn any combination of gasoline, methanol or ethanol.
    Burning alcohols produces far less air pollution than gasoline, and the Chinese could use their large coal reserves to produce methanol fuel.

  • rate this
    +1

    Comment number 136.

    132.HilaryJ
    2 Hours ago
    121.Rebecca Riot
    'City smog shows that China is at least 100 years behind. This kind of pollution was last seen in Britain during late 19th Century.'

    Errrrrrrr no! Look up London smog of '52 ...

  • rate this
    +1

    Comment number 135.

    Everytime you buy Chinese goods your adding to the smog & pollution - perhaps the West should say no more until they literally clean up their act!

    Afterall Chinese smog/pollution affects us all - not just the workers in Chinese sweatshops which is bad enough!

  • rate this
    0

    Comment number 134.

    Cleaner sources of energy are much much more expensive.

    Any cuts of polution will just be reversed as Chinese economy grows to improve the lives of hundreds of millions who are still poor, as well as increased polution in india/Asia/Africa.

    The growth of world economys & consumerism will negate any/all polution improvements.

    Even with world population levelling, polution will increase

  • rate this
    +1

    Comment number 133.

    Manufacturing and modernisation creates effects, we used to be the same. When they can afford it they will invest in cleaner technology or be like the UK and produce nothing but paper.
    This is nothing to do with "global warming"

 

Comments 5 of 137

 

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