(Yicai Global) Dec. 21 -- Local emissions are the main sources of heavy air-borne pollution with a density of PM2.5 in Beijing, Tianjin and Hebei, accounting for around 70 percent of the total, an expert panel in Hebei says.
In Beijing, Tianjin and Hebei, local emissions are the cause and source of the bulk of all pollutants, the expert panel for the joint research on air pollution control said
Pollutants transmitted from surrounding provinces and cities contribute roughly 30 percent of the PM2.5 density air pollution in the capital and neighboring Tianjin and Hebei, with Shandong and Henan identified as the two major sources of emissions.
Shanxi, Inner Mongolia and Shaanxi province also contribute to the pollution with local emissions to some extent but they are not major sources.
The industries in the three regions primarily involve thermal power, steel and construction. Coal is the dominant energy source and highways are the main transport links, so their pollutant discharges remain high, the expert panel added.
The area of the three regions only accounts for two percent of the country's total, eight percent of its population and 9.2 percent of its coal consumption, yet discharges of sulfur dioxide, nitrogen oxide and dust per unit area were respectively three times, four times and five times the national average, research found.
In Beijing, Tianjin and major cities in Hebei province, pollutants with a reading of PM2.5 increase by about half during the winter when heating is required. The large amount of pollutant discharges in winter is the root cause for the heavy pollution in the three regions.
The extreme unfavorable weather conditions are also one of the underlying causes for the heavy air pollution, which is causing wide-spread public concern.