Sino-Japan Collaboration for Air-pollution

Discussion Paper
Sino-Japan Collaboration for Air-pollution

Recently, many mega-cities in China are suffering from heavy soot-laden smog including small particulate matter such as PM2.5. First reason is that there must be a very stable atmospheric condition with weak vertical exchanges of air between a boundary layer and upper layer that leads to the formation of fogs and haze. Second reason is the very high concentration of aerosol (mixed by Particulate Matters, SO42-, NO3-, NH4+, etc.) exceeding the threshold. Most of aerosol derives from human economic activities and everyday life, for example, fossil fuel burning (particularly, coal and oil), industry process, construction activities, cooking, etc.
The Chinese government has attempted to show their willingness to solve the problems with various measures such as shut-down/relocation of the factories, promotion of clean energies, restriction on the number of cars on the road in mega-cities. However, the background of current smog problem is the issue of energy mix (fossil-fuel dependence) and unsustainable development pattern, and there is no instant solution available. Therefore, although it may take time, to ameliorate the seriousness of current situation requires additional and more fundamental measures to be taken. Such measures include: further optimization of energy mix (de-carbonization), capping of the energy consumption, energy system reformation, improvement of oil quality and development of de-dusting infrastructure.