China’s Academy of Sciences have been hard at work researching the composition of PM 2.5 particles in order to trace the source. They found that the PM 2.5 particles in Beijing contain six important elements: dust (15%), coal (18%), biomass burning (12%), vehicle exhaust and waste incineration (4%), industrial pollution (25%) and secondary inorganic aerosols (26%).
These findings have given the government new food for thought on how to clear the skies in China’s capital. Most interesting is the fact that vehicle emissions only account for 4% of the total composition of the smog, which was previously thought to be higher.
Source: beijing.qianlong
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Keywords: Beijing finds six sources of PM2.5
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Here is the chemist: secondary inorganic aerosol are mainly 3 compounds ammonium, nitrate and sulfate. They are formed in the atmosphere (hence the name secondary) as result of difficult chemical processes from precursor gasses ammonia, NOx and SO2. Cars emit NOX (NO and NO2) and contribute significantly to secondary aerosol. So the article is not completely right by stating the 4% is from vehicle emission. This 4% is most likely primary aerosol which is emitted by friction from tires and brakes etc.
Jan 02, 2014 11:09 Report Abuse
Secondary inorganic aerosols? Anyone? EDIT: seems to be the result of chemical processes between different kinds of (primary) pollution. A big one would be ammonia from agriculture & livestock reacting with acidic gases from industry, hence causing the next generation of pollutants. Obviously I'm not a chemist.
Jan 01, 2014 20:11 Report Abuse
So, if the 4% is for cars, which we believe is actualy at least 60%, so there should be huge huge huge rubbish going out of industrial chimneys....
Jan 01, 2014 11:26 Report Abuse
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