Emissions from motor vehicles, coal-burning and cooking contributed to the dense smogs in Beijing in January, according to research results issued by the Chinese Academy of Sciences.
The three factors made up 50% of the contributions to the five heavy smogs last month, according to the research of the “haze’s cause and control” group under the Chinese Academy of Sciences (CAS).
Motor vehicles account for nearly a quarter of Beijing’s PM2.5, said Wang Yuesi, a CAS researcher. Coal burning contributed to 20% of the PM2.5, according to Wang, noting dust from construction sites should also be further brought under control.
The Beijing-Tianjin-Hebei area should focus on limiting industrial production and improving the process of coal burning, enhancing desulfurization, denitration and dedusting in the burning process, Wang said.
He also suggested giving high attention to emissions from diesel-powered cars and fuel quality.
The research group spotted hazy weather in the Beijing-Tianjin-Hebei area in the periods of 6-8 Jan., 9-15 Jan., 17-19 Jan., 22-23 Jan., and 25-31 Jan. During the period from 25-31 Jan., PM2.5 readings of more than 300 micrograms per cubic meter lasted for more than 50 hours, the research result shows.
Initiated in September 2012, the research project aims to explore the formation of regional smog over a period of five years and develop technologies for curbing key pollutants that cause hazy weather.