US advises its citizens not to travel to China due to the Coronavirus
This 'don't go there' is a 'level 4 'advisory.
The four advisory levels, from low to high regarding safety and security risk, are:
- Level 1: Blue - Exercise Normal Precautions
- Level 2: Yellow - Exercise Increased Caution
- Level 3: Orange - Reconsider Travel
- Level 4 : Red - Do Not Travel
With this, a blanket advisory for the whole of China, how far away can a stop to air traffic between the two countries be?
