Of course, you could actually look something up, Little Twink, rather than just flapping yap.
Researchers identify primary sources of city air pollution - Global Times
Researchers identify primary sources of city air pollution
Source:Global Times Published: 2013-12-30 23:18:02
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Research fellows have found the main source of particles with a diameter of less than 2.5 microns in the Beijing air is fossil fuel combustion emissions, Xinhua reported Monday.
A research team at the Institute of Atmospheric Physics in the Chinese Academy of Sciences found six sources: soil dust (15 percent), coal burning (18 percent), biomass burning (12 percent), vehicle gas emissions and garbage burning (4 percent), industrial pollution (25 percent) and secondary inorganic aerosols (26 percent).
Coal burning, industrial pollution and secondary inorganic aerosols combine to form fossil fuel combustion emissions, a total 69 percent of pollutants.
Researchers analyzed samples mainly in downtown Beijing through 2009 and 2010.