China's emissions reversal cause for 'cautious optimism' says study. As part of the Paris Agreement, China pledged to peak its CO2 emissions by 2030. In fact, China may already have fulfilled this commitment, with emissions peaking in 2013 and declining in each year from 2014 to 2016

Warning PDF.

With any data regarding China you should question if it's true. Caixin in did in 2012 a report where public data is often manipulated and may be far off from the truth. In this case it was internally reported that their NOx output instead of declined over the past 5 years actually more then doubled.

Another problem in the same PDF you will find that "pledges of emission" often fail through corruption. I wouldn't be to hopeful about China that they do as they claim vs what actually happens.

Sofar the real difference is that big spikes seem to be less, though overall pollution is still atrocious. To give you an example, the city where I got send on an average day has twice the maximum pollution rate at any given day of what the WTO considers safe and this is in the South which is considered "clean".

/r/science Thread Link - uea.ac.uk