Most air pollution in Beijing is actually the result of local
emissions of pollutants, which accounted for 64-72 percent of the smog
in the Chinese capital last year, according to the latest research from
the city's environmental protection agency.
More @ ECNS
Automobile traffic, coal consumption, industrial production and dust
were the main sources of the PM2.5 that reduced the air quality in
Beijing; they respectively contributed 31.1 percent, 22.4 percent, 18.1
percent and 14.3 percent of the hazardous particles discharged into the
city's air. Restaurants, auto repair shops, livestock breeding
facilities and building construction and renovation are responsible for
the remaining 14.1 percent of PM2.5 discharge.
As for the composition of PM2.5, organic matter (OM), nitrates
(NO3-), sulfates (SO42-), crustal elements and ammonium salts (NH4+)
took up the largest shares, respectively contributing 26 percent, 17
percent, 16 percent, 12 percent and 11 percent of the total mass of
PM2.5 in Beijing's air. The research also showed that secondary particles, i.e., particles
formed by gaseous pollutants, accounted for 70 percent of all PM2.5
concentration, and were the primary reason for occasional heavy air
pollution.
Automobiles also contributed considerably to the city's soaring PM2.5
readings. Apart from directly emitting polluting elements, vehicles
also served as "blenders," stirring up dust in city streets.
Since cross-region transfer still constituted 28-36 percent of the
PM2.5 mass concentration in Beijing, the research report urged joint
efforts with Beijing's neighboring Tianjin Municipality and Hebei
Province to reduce the region's overall emissions of pollutants.
No comments:
Post a Comment