Nav: Home

Where is heavy air pollution in Beijing from?

January 09, 2017

Beijing's latest smog alert has dragged on into the first week of 2017. In fact, the joint prevention and control policy for atmospheric pollution in the Beijing-Tianjin-Hebei region was announced after the heavy haze event occurred on 1 January 2013. But it is still uncertain about what or where to control and prevent in detail.

The research group led by WANG Yuesi from the Institute of Atmospheric Physics (IAP) has monitored the evolution of regional atmospheric mixing layer height (MLH) and attenuated backscattering coefficient in the Beijing-Tianjin-Hebei region for years. Combined with the particle's chemical component online analysis, some highlighted results about the regional heavy haze formation mechanism are obtained. "Beijing is located to the north of the North China Plain. During the initial polluted period, it is affected by southerly transport at the latitude of 500-1000 m." WANG find, "Once the pollution is formed, the MLH will decrease quickly to 500m even lower and increase the pollutant concentration rapidly with compression mechanism. Meanwhile, the hygroscopic growth and heterogeneous chemical processes enhancement under the circumstance of high relative humidity will facilitate the explosive growth of secondary particulate matters."

The co-existence of those factors can further exacerbate the pollution degree. At this time, although the impact of regional transport is less important, the local emitted (such as motor vehicles) pollutants are unable to diffuse, thus will result in a consistent increase of the pollutant concentrations in the MLH.

The heavy haze formation in Beijing is therefore depicted as "initiate by the regional transport mainly from the coal burning in surrounding areas, and intensified by the local secondary formation originated from the motor vehicles". This conclusion is presented in papers written by TANG Guiqian, LIU Zirui, WANG Lili, HU Bo, XIN Jinyuan and ZHU Xiaowan and is confirmed consistently by some new experimental researches.

According to these researches, suggestions are proposed to the environmental protection administration: Pre-warning should be implemented two or three days ahead of the heavy haze coming, and the regional stationary emissions especially the elevated sources should be controlled and reduced in advance. Once the pollution formed, the local emissions should be controlled, thus the peak values of contaminant can be efficiently restrained.
-end-


Institute of Atmospheric Physics, Chinese Academy of Sciences

Related Pollution Articles:

Diesel pollution linked to heart damage
Diesel pollution is linked with heart damage, according to research presented today at EuroCMR 2017.
Air pollution may disrupt sleep
High levels of air pollution over time may get in the way of a good night's sleep, according to new research presented at the ATS 2017 International Conference.
Smoking out sources of in-home air pollution
An ambitious study led by San Diego State University researchers has investigated various factors that contribute to air pollution inside the house.
Where is heavy air pollution in Beijing from?
The heavy haze formation in Beijing is depicted as 'initiated by the regional transport mainly from the coal burning in surrounding areas, and intensified by the local secondary formation originated from the motor vehicles.'
Future PM2.5 air pollution over China
There is a long way to go to mitigate future PM2.5 pollution in China based on the emission scenarios.
What happens when people are treated like pollution?
In cities where homeless persons are viewed as an 'environmental contaminant' -- a form of pollution, efforts to purge the homeless from the area tend to push them to the fringes of the community and diminish their access to the urban environment and the resources it provides, according to an article published in Environmental Justice.
Reducing ammonia pollution from cattle
Agriculture is responsible for 90% of all ammonia pollution in Europe, a considerable part of which comes from cattle manure management: a new study shows what steps to take to reduce this pollution.
Getting maximum profit, minimal pollution
In a new study, researchers at the USDA-Agricultural Research Service have calculated how much chicken litter farmers need to apply to cotton crops to maximize profits.
Containing our 'electromagnetic pollution'
Electromagnetic radiation is everywhere -- that's been the case since the beginning of the universe.
Diabetes: Risk factor air pollution
Exposure to air pollution at the place of residence increases the risk of developing insulin resistance as a pre-diabetic state of type 2 diabetes.

Related Pollution Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Digital Manipulation
Technology has reshaped our lives in amazing ways. But at what cost? This hour, TED speakers reveal how what we see, read, believe — even how we vote — can be manipulated by the technology we use. Guests include journalist Carole Cadwalladr, consumer advocate Finn Myrstad, writer and marketing professor Scott Galloway, behavioral designer Nir Eyal, and computer graphics researcher Doug Roble.
Now Playing: Science for the People

#530 Why Aren't We Dead Yet?
We only notice our immune systems when they aren't working properly, or when they're under attack. How does our immune system understand what bits of us are us, and what bits are invading germs and viruses? How different are human immune systems from the immune systems of other creatures? And is the immune system so often the target of sketchy medical advice? Those questions and more, this week in our conversation with author Idan Ben-Barak about his book "Why Aren't We Dead Yet?: The Survivor’s Guide to the Immune System".