"Ports to start implementing China ECA regulation"
Effective 1st Apr 2016
Ports
Shanghai/Ningbo/Zhoushan/Suzhou/Nantong
Mandatory
all vessels has to switch to compliant fuel (Sulfur Max 0.5%) within one hour (time allowance) after arrival at berth, vessel may switch back to non-compliant fuel one hour prior to sailing.
Voluntary
0.1% fuel while at berth
0.5% fuel while in Changjiang ECA
Source
http://www.moc.gov.cn/jiaotongyaowen/201601/t20160119_1978652.html
The announcement doesn't address to the question of vessels anchoring at anchorage for lightening or for bunkers only call. We will advise more info in due course.