China’s three busy water areas have shown important reductions in ship emissions, already by 2015, as vessels that voyage in these three areas were obliged to stricter emissions limits, according to Xinhua. The ministry in December 2015 set up ship emission control zones in the three water bodies in a drive to improve air quality, particularly in port cities in the zones.
Specifically, vessels in Bohai Sea area, the Yangtze River Delta and the Pearl River Delta that emit oxysulfide and other...
https://safety4sea.com/china-divides-ship-emissions-to-three-water-areas/