2016-10-25: Reduction in NOx emissions over China: synthesis of satellite observations and emission inventories
A significant variation in the peak year of NO2 column densities over regions is observed. Because of the reasonable agreement between the peak year of NO2 columns and the start of deployment of denitration devices, we conclude that power plants are the primary contributor to the NO2 decline, which is further supported by the emission reduction of 56% from the power sector in the bottom-up emission inventory associated with the penetration of Selective Catalytic Reduction (SCR) increasing from 18% to 86% during 20112015. Meanwhile, regulations for vehicles also make a significant contribution to NOx emission reductions, in particular for a few urbanized regions (e.g., Beijing and Shanghai), where they implemented strict regulations for vehicle emissions years before the national schedule for SCR installations and thus reached their NO2 peak 2-3 years ahead of the deployment of denitration devices for power plants.
We conclude that emission control measures are capable of reducing Chinas NOx emissions to a large extent, as is shown by our results, in particular after the year 2012. This strong decrease in NOx emissions suggests that measures can be taken in developing countries that will reduce emissions alongside with rapid economic development.
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